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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 ( ZNGA): "I think the new CEO is a winner. It's too late to sell and time to buy." Alpha Natural Resources ( ANR): "If you like coal, buy some Joy Global ( JOY). " Exelon ( EXC): "It's not my favorite but it can go up a buck or two." Micron Technology ( MU): "There was chatter about companies opening new factories. I'd buy half here and buy the rest if it goes lower." Northrop Grumman ( NOC): "I like Boeing ( BA) more than I like Northrop." To read a full recap of "Mad Money" on CNBC, click here. To sign up for Jim Cramer's free Booyah! newsletter with all of his latest articles and videos please click here. To watch replays of Cramer's video segments, visit the Mad Money page on CNBC. -- Written by Scott Rutt in Washington, D.C. To email Scott about this article, click here: Scott Rutt Follow Scott on Twitter @ScottRutt or get updates on Facebook, ScottRuttDC