The horse has a big jar full of money from the tips he makes. The bar and horse are offering the jar full of cash to anyone who makes the horse laugh. No is able to make the horse laugh

A guy walks in the bar and hears about this, so goes to try to make the horse laugh and he does and everyone at the bar is surprised and he gets the jar of cash

The jar is full of money again and the bar is offering anyone the money whoever can make the horse cry. So the same guy comes in and goes to the back with the horse and they both come out and the horse is crying.

Owner: Ok How did you make the horse laugh and cry what did you do??

Guy: I made him laugh by telling him I bet my dick is bigger than yours I made him cry by showing him in the back