'Mad Money' Lightning Round: Time to Buy Zynga

Tickers in this article: AMR BA EXC JOY MU NOC ZNGA
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NEW YORK (TheStreet) -- Here's what Jim Cramer had to say about some of the stocks callers offered up during the "Mad Money Lightning Round" Thursday evening:

Zynga : "I think the new CEO is a winner. It's too late to sell and time to buy."

Alpha Natural Resources : "If you like coal, buy some Joy Global . "

Exelon : "It's not my favorite but it can go up a buck or two."

Micron Technology : "There was chatter about companies opening new factories. I'd buy half here and buy the rest if it goes lower."

Northrop Grumman : "I like Boeing more than I like Northrop."

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-- Written by Scott Rutt in Washington, D.C.

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