Unseen University was much bigger on the inside. Thousands of years as the leading establishment of practical magic in a world where dimensions were largely a matter of chance in any case had left it bulging in places where it shouldn't have places. There were rooms containing rooms which, if you entered them, turned out to contain the room you'd started with, which can be a problem if you are in a conga line.
Terry PratchettIf you try to to take my bananas from me, I will reclaim them from your cold dead hands.
Terry PratchettWho shall I shoot? You choose. Now, listen very carefully: where's your coffee? You've got coffee, haven't you? C'mon, everyone's got coffee! Spill the beans!
Terry Pratchett