Turn a Blind Eye
During my first trip as an airline pilot, we had a passenger get a little tipsy and flash the cabin. There were no children on board, so the flight attendants didn’t even bother to tell us until we were waiting for the hotel van.
Same month we had a couple near the back of the plane lift the middle armrest, and do it under a blanket. They were kind enough to take the blanket with them at the end of the flight. This spawned a conversation about the worst passengers that those flight attendants had dealt with. The winner of that conversation had found a designer glasses case, left behind in a seat, that had a telltale sticky white substance in it.
I am not saying that you will get away with it, it all depends on what the flight crew wants to do about it and how much you are disturbing the other passengers. While many FAs will turn a blind eye, do you really want to find out if you’re flying with one that will not?
Story credit: Reddit / Sinkingpilot