As if Australians didn't have enough to worry about from their deadly fauna, now their flora are out to get them as well. The town of Warragul, Victoria, houses a 120-year-old bunya pine whose pine cones are the size of watermelons. The behemoths weigh up to 10 kilograms each, and, the local council warns, can leave a nasty crack in your head if you happen to be under one when it falls. So if you don't intend to wear a helmet everywhere you go, it's a good idea to look up occasionally.

Warning over watermelon-sized pine cones [ABC News via mental_floss]