When I woke up I had the worst gas of my entire life.
I've heard other people say the same thing, so it makes me wonder. After that real thorough ahem "cleansing," how can you possibly trust a fart?
I'm thinking I'll still be kind of out of it and all of a sudden realize that I'm feeling gassy.
P.S. -- Everybody I've talked to says just do it, for the reasons mentioned in this thread.