While I was grinding some Checkpointless runs, I accidentally stumbled upon something that didn't seem right.

Coming in to level 2, I jumped way earlier than I was supposed to, and landed right on the 2nd toothpaste thingy. I should have died here, but I didn't.

I jumped right off it.

I think this is some sort of different form of Death Plane Jump, except you don't need a death plane to do it. Or was it a death plane? Not quite sure.