I once flew with a flight attendant who confessed her dirty prank on crews she didn't care for.

When she was ready to rip one, she would come into the cockpit and make small talk. As she left, she would release the air between her buns and shut the door behind her.

Now, within seconds the whole cockpit would stick of you know what. None of the pilots would expect that this came from the cute F/A, of course, so it was left for the pilots point blame among each other.

Beeatch!