Have anyone mentioned this?
Have you ever wondered why the flush button in airline toilets are usually designed in such a weird, inconvenient position?
Because they want you to move your butt before pressing that button, or you may need to press the emergency button as well.
Ok, here is how toilets on airlines work, unlike common toilets on the ground, they would vacuum and create a suction to clean itself, the suction can be strong enough to make a pretty firm grip to some fat or plump butt.
Having been called to solve emergencies like this for several times, the airline staff got really annoyed, they tried to warn people about this by putting up signs like,MOVE YOUR ASS BEFORE FLUSH, but nobody would pay attention, at last the plane manufacture companies like Boeing finally moved that button to that position so people would have to move their fat ass a little.