Fisker is the ultimate speculative stock: Cramer's lightning round.

• Jim Cramer is once again answering callers' stock questions at a rapid pace, as indicated by the ringing of the lightning round bell on "Mad Money."

It's okay, but keep in mind that the stock market is volatile, so you may want to proceed with caution.

Following some tough times, now comes the prosperous period.

Fisker is a promising stock, but it's only a speculative investment.

The government will not allow United to go up because they made an offer for []. I am stating this unequivocally.

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