I kind of wish you hadn't brought this up, and I also kind of wish I had the self-discipline to refrain from posting on yet another pony comment. Ponies are not buddies, and if you need a bailout bottle for recreational diving, and/or simply carrying one allows you to dive in a way that you otherwise would not, you're probably not diving in the safest manner. (I'm guilty of that as well, so don't take it personally) If it makes you feel better, fine, but I would not assume it adds any significant safety on it's own. I've used them, and it does give you a nice warm/fuzzy feeling to have something right there in case your regulator explodes or you get mugged by a werewolf/zombie/Elvis Presley or some other "high probability" (hehe) problem. Too bad it doesn't help with stuff like navigation problems, sickness, entanglement, loss of buoyancy, accidental water ingestion, etc.....you know, the stuff that NEVER happens....
Sorry, sorry, I'll shut up now. I guess since this is a thread about risky dive behavior, it's not too badly off topic.