Ok, definitely makes it onto my list of funniest moments in life, i'll share the photo and then explain.
So this is my friend. We were at the lake one day and to get there, you walk over some massive sand dunes, literally looks like a desert. So the guys decided to have a race to the top, after completion, this one above decided it'd be fun to roll all the way back down. So he started rolling and began to pick up speed (bear in mind this particular dune was maybe 15 meters high) and ended up flying in the air and face-planted in the sand. Luckily there were about 3 of us who watched the entire thing and i had my phone handy for evidence. Seriously even just typing this i can't help but crack up laughing, one of those things you just had to be there for. His facial expression was so confused just like above and see the line of sand coming from his mouth? Dribble. Thats just how fast he was going.