Montezuma's revenge.
It was a flight back from Hawaii some years ago. I had lunch at some hole in the wall resturant earlier that day and the food somehow upset my stomach. Half way over the Pacific my stomach acted up and I had to use to toliet. Without getting into to much deal there was a violent explosion that went along with a smell that couldn't be removed.
Of course I was embarrased by what happened and quietly made my way back to my seat. It wasn't long after that when passengers started complaining about a foul smell
