A guy was at the supermarket and after buying a few things he began to queue up in this really long line for the checkout.
After about 15 minutes in the line he reached the checkout girl and just at that moment he remembered that he needed some condoms. Not wanting to line up again he said to the girl "Oh I meant to buy some condoms but forgot"
"Do you know what size you are?" she asked. "No," he replied.
"OK drop your pants and I'll tell you what size you are".
The guy then, not being the shy type, drops his trousers and the girl has a feel with her hand and then says in the microphone "1 packet of large condoms to aisle 3 please", he pulls up his trousers, the condoms are brought to him and he pays his bill and goes on his way. Another male customer sees this and thinks he'd like to have this nice girl fondling his prick and so says the same thing to the girl.
A similar course of events takes place, only this time after having a feel she says "One packet of medium sized condoms to aisle 3 please", the condoms are then brought to him and he pays the bill and goes on his way. Also watching this course of events was a rather excitable 15 year old boy who then decides to queue up and try the same routine. "I'd like to buy some condoms please, but I forgot" he says.
"Do you know what size you are?" she asked. "No," he replied. "OK, I'll check. Whoops, mop and bucket to aisle 3 please!"