Many universities have a sinking library rumour. It usually goes something like this:

Okay, so like, the university library is sinking into the ground because, like, when they designed it they didn't take into account the weight of all the books. So all the heavy books are pushing the building into the ground! Dude!

This rumour has cropped up at a number of universities. Specifically, it's used to explain why the seventh floor of the library at the University of Calgary is always closed. (The real reason is that the seventh floor is full of heating equipment - tons of it). Similar stories have also been found coming from Stanford and other midwestern universities. The rumour has never been substantiated.