Cramer: When to pull the trigger on this $1 billion company

It's that time again! Jim Cramer rang the lightning round bell, which means he gave his take on caller favorite stocks at rapid speed:

Shake Shack: "We don't care where a stock has come from, we care where it's going to. There is now a $1 billion valuation. A little bit less than that, and I'm interested. Down 20 percent from here and I think you pull the trigger

Manitowoc: "Down here I think you want to buy it. It's a nice interesting chip in a game of a turn."

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Fiesta Restaurant Group: "It has been eviscerated, as have many of the restaurant stocks."

Air Transport Services: "Cargo and transport. You know, I'm a FedEx guy when it comes to that area. I'm not going to bless that air transport."

Whole Foods Market: "You buy more. This turn is real! The other guys are going by the wayside. They are turning around Whole Foods. This is the level I want you to buy it."

First Solar: "I think it's an overreaction to the downside. A lot of people just don't like that stock right now, but we have liked it for years and it's been OK."

Seadrill: "Interesting spec. $3 but I'm not there because I know that that balance sheet is not good. I'm with Schlumberger."

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