I ride a track bike with a flip flop. After my friend helped me build my bike i rode it around for a few days without any problems. I wasn't skidding, I was merely backpedaling or resisting when a light suddenly changed, i rushed to stop and really cranked down and it slipped because my cog and lockring weren't tight enough. I guess i had to break the bike in. anyhow, i just rolled right into the intersection and almost ran some people over, i hung a right to avoid traffic and everything turned out okay. Sorry, no carnage.