It's because if you ramp, you take no falling damage and make no sound. The same effect as a cushion, except this is more of a bug. Hard to do on stairs, fairly easy to do on ledges >22u in height.
It's about as much of a challenge as landing on the edge of a jumppad, with a bit of practice.
Edited by KittenIgnition at 03:19 CST, 10 November 2011
hmm how about getting stuck in corners. It has happened to me few times and I tried unsuccessfully to replicate it in ztn at the corner where u enter the 50 health bubble corridor left to the tele exit. I got stuck there twice in the corner before the bubble. A logical explanation could be a half to 1 sec 999, but that would be too devilish unlucky (always while being chased and at the very end of the corner). Also at t7 where u enter the rail room from red.
Ya its happened to me. I think its just the wall bugs like http://www.youtube.com/watch?v=TAQVyjtn_9Q where you clip onto the wall. Theres one on dm13 in the LG YA room on the bottom wall.
on t7 there are sooo many ways not to take any damage when falling down in the water (near the plates etc.) bugs ftw. being able to replicate them in games, however, is pretty difficult.