This guy goes to the doctor to get his penis enlarged. "That can be done", asid the doctor. So he goes under the knife and the doctor implants a piece of muscle taken from an elephant's trunk. The surgery goes without complications and the guy is very happy with his new endowment.

Anyhow, a few weeks later the guy is out to dinner with his girl and all of a sudden his penis reaches up and grabs a roll off of the table and then went back underneath. "I am sorry", said the man. "I have never been so embarassed in my whole life!". His girl replied, "Oh no, I thought it was great. Can you do it again?". "Well I probably could", he said; "But I don't think that my ass could take another roll.

Thanks to Brangwen.