I've had a ridiculous video running through my head for the last week, and can't find it. Maybe the Tumblr hivemind can help?
The scenario is set somewhere during WWII. There's a woman who appears to be a high-level administrator who's trying to talk to a Commanding Officer (CO) about something, but he's in the middle of changing. Also, he's trying to seduce her. Also-also the person playing him appears to be a dark-haired woman. But once the CO takes off his clothes, it's clear that there are two people playing him. One is the original person, who has an outrageous mustache. The other is a muscular dude whose body we see at different times through random apertures. As the CO moves around a bathroom getting dressed, they move in such a way that there is a way to disguise the fact that it's two actors playing one character.
It's really brilliantly done, but I can't find it, no matter what I search for.