The Version I Know Of A Classic

These two guys are hiking through the woods and come across a ravine. Wanting to cross, they look around for materials and see a pile of old ropes. They decide the best way to cross would be to build a rope bridge.
One guy turns to the other and says, "Start tying the ropes together, I'm going to go take a poop."
"What?!!?" his friend says, "You're going to leave me to do all the work??"
"Just trust me," the guy says, "This'll work. I shit, you knot."