Once there was this guy who was having trouble getting up for sex, so he goes to his friend and tell him his problem to see if he's got anything that can help. His friend reaches into the cupboard and hands him some ointment and tells him to rub it on. So when the guy gets home he puts it on and then it starts to get up, so he screws his wife. After that he calls his friend and thanks him so he keeps taking them.
Three days later his friend calls him on the phone and tells him he gave him the wrong tube. So the guy gets the tube and reads it, it said, "Mole Remover: Apply three days, the mole gets hard and then falls off."