A gay bloke in a pub reconed he could tell what make and type of spark plug inserted into his rectum just by the feel of it.
One chap goes to the car park and removes a plug from his car, comes back and gently inserts it into his rectum.
"Thats a Bosch DR8BPX"
Which of course was right.
Another chap goes and gets a plug from his bike, comes back and inserts that one.
"Thats an easy one, it's an NGK BPMR6A"
Again he was right.
"Right I'll have the little sod" another bloke says.
"Lets see if you get this one right!"
When the gay bends down he undoes his zip, gets his dick out and rams it right up his arse.
"Oooh, CHAMPION"