Here's a sick, but good one.
There's a man holding auditions to try and find the next big person out there and be the one to get the big money. So far, the audition has been a flop. Then a 70-year old man comes in, and the man asks "OK, buddy...what's your big thing?"
The old man responds, "Well, I can sing out of my rectum."
The man giggles and looks at the elderly man, saying, "Yea right. You must have taken too many pills today."
Lone behold, the old man drops his pants and sings "rock the boat" straight out of his rear. The mans eyes widen and says "You're in. We'll make a fortune off of this whole thing."
Well, the first night for the old guy to sing comes. The place is completely sold out. The old man steps onto the stage and is given a standing ovation by the audience. The old man then bows, drops his pants and takes a dump on the stage. The audience is instantly disgusted, and the man comes running out onto the stage.
"Hold on," the man yells, "I thought you could sing out of your rectum!!"
"I can," the old man said, "but first I have to clear my throat."