I have been on three flights now where the flight attendants had to open every overhead compartment in the plane for a person who could neither:
a) remember what their luggage looked like
b) remember which compartment they put their luggage in
Each time causing an enormous commotion of hollering and fussing between the dolt unable to recognize the luggage, the flight attendants, and usually 2+ disgruntled passengers. And each time preventing me from being able to sleep on the flight.
Never whistle while you're pissing.