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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" Friday night: VirnetX ( VHC): "I continue to think this is a great speculative stock." Isis Pharmaceuticals ( ISIS): "It's beginning to move up on good news. I want to stay in for a little bit more." Buffalo Wild Wings ( BWLD): "I'm concerned. I didn't like the last quarter. I need to see another quarter before I can recommend it." Proto Labs ( PRLB): "I like 3D Systems ( DDD) and Stratasys ( SSYS). Those are the better plays. " The Bank of Ireland ( IRE): "I think Ireland is a fabulous place to invest. I like Banco Santander ( SAN) in Spain as well." Frontier Communications ( FTR): "I'm not getting behind this one. I do like CenturyLink ( CTL) but I'm not trusting Frontier." 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