Cramer's lightning round: Groupon is a reopening stock

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

Invitae: "I've got to do more work on it."

McDonald's: "They have been inconsistent of late, OK, and the inconsistency is driving people crazy. It yields 2.5%. When it gets to 3% — even if it's inconsistent — I'm going to say buy."

Facebook: "Can the stock get cheaper? Of course, it can. Is it inexpensive on its growth rate? Yes, it is."

Groupon: "It's a reopening stock. It's a local reopening stock, and there's not that many of those and it is one of them that works."

Disclosure: Cramer's charitable trust owns shares of Facebook.

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