The seamless video branching of this simulator by Guy Cotten is impressive. It starts with a brief movie, then the character whose eyes you're seeing through gets knocked into the water, and you have to keep scrolling upward quickly and constantly, or you sink and die, in an elaborately artsy imagining of life flashing before your eyes.
The lesson? Swimming is harder than you think. Especially when your swimming is all done with a typing finger.
It's a bit like that Robert Redford boat movie All Is Lost, if that had been more realistic and not had to pad out a full feature-length run time.