Jim Cramer's Mad Money Lightning Round OT (FTNT, COCO, NAT)

On CNBC's Mad Money Lightning Round OT, Jim Cramer said that investors should not buy Corinthian Colleges, Inc.

. He explained that this stock is so low that he is tempted to pull the trigger, but he hates whole for-profit education group. Corinthian Colleges (

) fell 0.18% on Friday, and closed at $5.43. Cramer thinks that Nordic American Tanker Shipping Limited

is still a buy, because it has a sustainable dividend yield. Nordic American Tanker Shipping Limited (

) gained 0.04% on Friday, and closed at $27.05. It is a good a idea to buy Fortinet, Inc.

, believes Cramer. He thinks that this company could become a takeover target. Fortinet, Inc. (

) dropped 2.27%, and closed at $21.51.