It's not quite a prank but..It was the done thing after final exams at college to cover those finishing with egg/flour/milk etc. The English course exams had just finished and I saw my friend Michelle carefully avoid the people throwing flour. Not wanting her to get away with it, I caught up with her and totally covered her with flour, to which she turned and said 'I do Languages and I have another exam in an hour'
(
MartinH,
Tue 26 Feb 2002, 7:23,
archived)