Dan and Will are on the beach, trying to impress the ladies when Dan say "I'm not having much luck with the women, Will."
Will gives him some advince by saying "Try putting a potato down your swim trunks. That's what I do, and the babes love it!"
Dan knew about Will's love life and agreed that he would try it to see if he could come close in matching Will.
They part and after several hours, Dan goes looking for Will to explain: "I tried the potato trick and I'm getting blown off worse than before."
After looking him over, Will said, "Uh ... try putting it down the FRONT of your trunks."