Because all the other fore letter words were taken (Thanks to... this now makes sense...)
Cuz if it were lying down it wouldnt make any sense. (first post to reddit, made up this joke today.. be kind)
You hear about a new one every day and none of them make any sense.
It's the only activity where you actually aim for the hole under 18 and you don't go to jail.
Because it's not the same three holes over and over again.