Nail polish contains acetone which is flamable and IIRC prohibited. Seems there was a thread about a women getting her hands slapped on flight for this.

Well I will admit to being a stinky passenger a few times. Was on a mountianeering trip and came off the hill with little time to spare before my return flight. As such, after 4 nights out I had no time for a shower before my flight. I did my best to get cleaned up including a little deodorant. Fortunatley, I had the window seat with no one in the middle but someone in the aisle seat.

Body odor is one thing but perfume worse in my book.