The Earth's North and South Poles flip polarity on a semi-frequent basis, having done so more then 20 times in the past 5 million years. That means that with the next flip, all compasses will be pointing South rather then North.
DID YOU KNOW? Marlon Brando hated memorizing lines so much that he posted cue cards everywhere to help him get through scenes.
He even asked for lines to be written on an actress's posterior. (That request was denied.)