Your cultural experiences growing up shape the kinds of food that you like, and nowhere is this more evident than in the case of Vegemite.
Australians grow up with and love the concentrated yeast paste spread, and almost everyone else in the world finds it disgusting. If you can get your hands on some (it isn't too hard to find, they sell it at World Market) then try pulling this prank on some less-well-traveled friends or roommates!
All you need is some Vegemite, a spoon, and one of the Australian leather change purses shown in the video (another piece of leather will do, just make sure it looks official enough to be an actual product that you bought). By the end of the prank, you'll have your victim literally licking Vegemite off of a leather sack, and there are few things funnier in this world than the look on a non-Aussie's face after that experience.