When I first got to boot camp the company commander sat us down and told us that there was only two ways to react to any situation in life: Laugh or cry. Then he made us run for half an hour with our duffle bags to drive the point home. It doesn't matter if you complain or joke about it, it already happened.
Whenever someone complained about something sucking, he'd tell them "This doesn't suck. I'll tell you when something sucks." So after a few months of that we grew the balls to ask him "Okay, so what does suck?" which he said "One armed mountain climber with jock itch." Kind of makes running three miles seem less horrible.