On CNBC's "Fast Money Halftime Report," Jon Najarian gave some unusual option activity plays.

Najarian sees unusual activity in:

• Ebay (NASDAQ:EBAY) May 14th $68 calls
• Howmet Aerospace (NYSE:HWM) July 16th $35 calls

He plans to be in the eBay position for the next two to three weeks and the Howmet Aerospace position for most of the next three months.