Funny facts – Students having foam fight
Students from St Andrews University take part in a foam fight as part of the traditional Raisin Monday celebrations in St Andrews, Scotland. The tradition dates back to the early days of the university when new students would give senior students a pound (0.45kg) of raisins in gratitude for their help in adapting to university life, in exchange for a receipt written in Latin. Failure to produce such a receipt could result in a dousing in the local fountain. Nowadays the raisins have been replaced with a bottle of wine and the dousing with foam. Prince William and Kate Middleton, who met at the university as undergraduates, took part in the celebrations in 2001.
(source : http://interesting-amazing-facts.blogspot.in/search/label/funny%20facts)