I watched @dha run something in HABBO in 18 seconds, and I was really confused about what the hell happened on the screen, so was the other people who watched it, judging by the comment section. Usually you can kinda see what the point of the run is, or what is runner trying to do, but sometimes you just stumble upon something so confusing you don't even know what is happening.

So, asked myself this question, what is the most confusing speedrun to watch, when you can't tell what's going on? You can also send really confusing glitches/strats/tricks, that is completely fine

Any fast-paced first-person game with lots of out-of-bounds tricks is usually pretty difficult to follow during your first watch. I remember my first time watching the Ghostrunner world record I was really confused what was going on in half of the run.

Dark Alliance Any% can be pretty confusing. A lot of goofy WW setups and loading screens that make it hard to track what is happening.