Within the last 4-5 years, I enjoyed a short movie, probably from SIFF because it was on an Alaska Airlines flight. It was about a man (Caucasian, probably in his 20's) who discovered or happened on how to either teleport or time travel in his bathtub. If he got under the water, and maybe did something, but I forget what, he'd teleport or time travel. As the movie progressed, he did stranger and stranger things with this ability, one of which was to teleport with only a part of his body under the water, a situation that ended up with his body severed at the waterline. But he was okay after that and the movie continued. I think that when he did this, the water would disappear from the tub.
This isn't Hot Tub Time Machine.