Cramer's lightning round: Why Tesla stock stopped going up

• 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.

Tortoise Acquisition II Corp: "I've got to have them on, frankly."

Caterpillar: "It's the premier infrastructure play ... CAT's real good."

Tesla: "The only reason Tesla's not going up is because it's up so much, but look I agree with you [on] Tesla and I think that one of the reasons why the growth stocks stopped going up is because Tesla stopped going up, but you know what, it's a reason to own it."

Canaan: "I do bless speculation, but that one, no. I'm not a goer there. Stick with Taiwan. Go with Taiwan Semi. You don't need those guys."

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