"The fact is, I do have a better handle on the situation than the Fed does, just like in 2007," Cramer said on "Mad Money" Wednesday evening. "Oh, I hate to show such hubris on this show, or anywhere or at home. But I am sick and tired of a Fed that reverts to a non-rigorous, non-homework-oriented approach every time things look good. It's like they unlearned all the lessons of the Great Recession."
In 2007, Cramer sounded off on then-Fed Chairman Ben Bernanke and then-central bankers for ignoring signs of the impending financial crisis. "They're nuts. They know nothing," Cramer blasted at the time.
Cramer, in recent days, has been stepping up his criticism of the current Fed, blaming Powell and other policymakers for not looking more closely at the economic data before announcing its lockstep interest rate hike plans.
Powell's remarks last week about monetary policy being a "long way" from neutral signaled a possibly more aggressive path for rate hikes, sparking a spike in bond yields to seven-year highs and applying pressure on stocks.
On Wednesday, Wall Street took at real plunge, with the dropping nearly , or 3.15 percent, in its worst one-session decline since February.
Click here for Cramer's full sell-off playbook.
On a for the major averages, Cramer decided to open the phone lines to investors worried about the state of the stock market.
His overarching message? "The time to start buying may be upon us," because what started as selling has now grown into what seems to be a full-blown panic, he said.
"A vicious correction is, indeed, a terrible thing to waste," he told viewers. "If you have some spare cash or if you're thinking about putting some long-term money away at the end of the year, maybe you pull some of it forward. That's what I did today for my kids' index fund."
The reason Cramer felt a bit better about buying was due to a trend he noticed in the market's trading volume. Investors were selling at a 10 to 1 rate, meaning the volume was heavily skewed to the downside, a sign that things could be getting oversold.
"On a day when volume was 10 to 1 on the downside, I am OK'ing small buys of some of the great stocks that we have followed and talk about," Cramer said.
Click here for the stocks he's talking about and why selling now might not be the best idea.
With shares of , and now the targets of high-profile — and the rest of the — Cramer wanted to make sure investors weren't getting ahead of themselves.
On Tuesday, hedge fund Pershing Square, run by Bill Ackman, in the stock of Starbucks; a $690 million stake in shares of PPG; and its existing stake in Campbell Soup's stock.
"You may be tempted to circle the wagons around companies that are being bolstered by activist investors," Cramer said. "After all, if very smart, very rich money managers believe in a stock, you probably think, why shouldn't you?"
But it's never quite that simple, and investors looking to buy one of the three may be left disappointed, the "Mad Money" host said.
"Piggybacking on these activists is a mistake unless you really believe in the fundamentals of the company," he said. "Hedge fund managers don't work for you and they have no obligation to tell you when they change their minds."
Between tariffs, rising costs and the flattening yield curve, Starwood Capital Group Chairman and CEO Barry Sternlicht isn't feeling too sanguine about the state of the U.S. economy, he said Wednesday in an interview with Cramer.
"I think the Fed is going to have to be careful," he told the "Mad Money" host. "The economy's not quite as strong as the number indicated."
One of the real estate investor's chief concerns was the yield curve, which is so flat as to almost make borrowing money at a two-year rate the same as borrowing at a 30-year rate.
"It's not what we're used to, but usually, it's a signal of a downturn. I think it is a signal of a downturn," he told Cramer.
And with a $300 billion stimulus package, the tax cuts and the trade dispute with China on the government's plate, "it's going to be tough" to get a handle on the situation, Sternlicht suggested.
"What people don't understand about the tariffs is you're going to see their impact, I think, in the first quarter of next year," he said. "Because the inventory was here — it's on the shelves, it's in the warehouse, it was bought without the tariff. So you're going to have a latent inflation pressure in the market which the Chinese are trying to deflate by knocking their currency down."
Click here to watch Barry Sternlicht's full interview.
If Carnival Corp. CEO Arnold Donald has learned anything in his years as a cruise industry leader, it's that a day like today can't single-handedly every facet of the economy or even the market.
"I am not a market expert, but I would say one day does not a trend line make, and the fundamentals and the U.S. economy and the world economy for the long term is what we have to look at," he told Cramer.
And investors looking for safer plays amid the downturn could even consider a stock like Carnival, a global cruise line operator with a steady, secular business, the company's president and CEO said.
"For our business, for the cruise industry, the reality is we're global and we are a great value, much better value than land-based vacations," Donald said. "And so we're attractive in almost any environment and we've said before we have no correlation to economic trends."
Click here to watch Arnold Donald's full interview.
In Cramer's lightning round, he rattled off his take on callers' favorite stocks:
: "The company issued a lot of equity today at $35.25. [The stock] spiked to $36.25. This is to get the done. And then it came back to $35. I like the stock. Call me a buyer."
: "It's neither here nor there. Look, if things keep heating up with China trade, it's obviously going to go lower. I think it's a good company – no edge right here."
—CNBC's Matthew J. Belvedere contributed to this story.