Make My Horse Laugh

There once was this bar with a sign in its window.
It read, anyone who can make my horse laugh will have all
the drinks they want on the house. So this guy walks in and
asks if he can give it a try. The bartender says sure.

The cowboy walks out there and whispers something in the
horse's ear. The horse starts laughing hysterically. The guys
walks in and the bartender gives him the drinks. The next night
the same guy and the same thing happens.

The third night the sign is changed to making the horse cry.
The guy goes out side and a few minutes later he comes back
in and the horse is crying.

The bartender says 'o.k. you can have your drinks but first tell me
what you did to make my horse laugh.'

The cowboy said, 'I told him my privates are bigger than his.'

'O.K. but how did you make him cry?'

The cowboy replied, 'I proved it to him.'

haha, very funny !