heh, if you think the propane used as propellant in shaving cream is non-flammable, do some experimentation. I still say the tsa uses arbitrary nonsense to judge what is ok and what is not. The trip I just took had completely different procedures and standards in the airports I was in, one had us leave shoes on, one off. One had liquids out of bags, one left in. One had electronics out and separate, one left in bags. My wife accidently had a razor with her on one flight, that was apparently no problem. Mayyybe this is a strategy to keep the badguys guessing. I think it's more likely arbitrary nonsense based on the mood of the supervisor at the moment.