When your life depends on it I should say. Clips just from todays ride home. I had to do a full power stop, unclip, leaning drag foot, crap in the pants stop. I bet it looked awesome. Well except for my face which probably looked like "holy Sh*t". An expletive might be heard on this video. Later in the ride there was this nice guy who picked up my rear light (even on a road bike, flashing lights and a bell folks) after it fell off my bike. Thanks!