A few months ago, towards the end of a very bumpy flight into JNB, seat belt lights had been on more or less the whole way down from the Zambezi, the poor bastard next to me asked an FA if he could go to the toilet. She said no. He said it's urgent. She walked off. I could see from the guy's body language and face that he was about to erupt, and I don't mean with anger. Then came the smells, becoming more frequent and more malodorous and lingering.
He let it go about 5 minutes before landing. I hope I never have that experience again.