Ethan, I thought it would've been dying on the kill screen before getting killed by the kill screen for you.
Personally, I would've said dying from the XX_X combination, but since I started avoiding it by wall-jumping, it's no more a problem for me right now.
I would personally say thta the most annoying death is point pressing on top, forward jumping over the X_X___X then backjumping over the last barrel, then climbing down, then forward jumping to the left this combination again and backjumping the last barrel. 90%+ of the time, you're able to do it without getting a barrel in the face, but sometime, depending on Kong's randomness, after landing the backjump after climbing down the ladder, you will get a barrel in the face in front of the middle ladder.
This frustrates me, because the 2x X_X___X is the coolest grouping to do in Donkey Kong, and it gives a lot of points if you can climb immediately after. So dying from bad randomness by doing this grouping is annoying. (I tried to explain this situation as best as I could, maybe someone can translate what I said if some don't understand!)