'Twas on Bravo's ramp leading into the flag on ctf_Kampf when we were getting pwned badly by a bunch of M249 Alpha soldaten. I didn't do any flip, and I already was in the bug before I jetted (which I did, after I ran up the ramp in a weird way; no crouching whatsoever. I think I used just left, right, and jump, and some radical mouse movement to mess up the anims.).

No matter how much I tried in-between numerous deaths I couldn't do it again ;-(