Lack of Gas Control
It seems that everytime I'm on a long haul overnight flight, at least one person, sleeping, cannot control their flatulance and fart every few minutes. And they always seem to be seated near enough to me to thoroughly poison the atmosphere all through the night. Getting really irritating. Thinking of investing in one of those little handheld fans to blow it back in their direction instead of flapping a newspaper. Rant over.