Found this gif on twitter
If my best friend won't fart in front of me, what else is he keeping from me?
Manny, Swiss Army Man
Paul had to ride real jet-ski-dan for one of the shots, hopefully didn’t give him a wedgie as suggested.
Right before we started filming the medium shot, we realized that Paul’s blocking involved pulling back on Daniel’s tie like the reigns of a horse. And there was a slim but real chance he could choke him. So all five boats, all 50 crew members, came to a halt, looking for a last-minute tie solution that wouldn’t choke him. Fifteen minutes later, we got Daniel’s real tie tucked down the back of his collar, and a different tie (run down his shirt and tied to his belt) coming out of the collar so Paul could “pull the reigns” and at the very worst give Daniel a bit of a wedgie. http://www.moviemaker.com/archives/series/how_they_did_it/swiss-army-man-fart-powered-jet-ski-corpse/
Swiss Army Man screenshots from the soundtrack preview
https://www.youtube.com/watch?v=u_Y_7NwuUHg Listen to the one of dan humming to jurassic park.