There is no question in my mind as to which is the most clever:
As for the funny ones, I'd have to say that this one was good. When my wife saw it she said, "That's funny."
Impotence: it can happen to anyone.
However, when she saw this next one she laughed so hard that she could not stop.
"Government warning: Don't buy a fake Rolex."
HandEFood, you win.