This year marks the 10 year anniversary of English theoretical physicist, cosmologist, and author Stephen Hawking's celebratory bash for time travelers only! Stephen threw a party complete with balloons, fancy food, and even a champagne pyramid. The thing is, Stephen didn't advertise the party until after the party was held; with the idea that if there really are time travelers they'd receive the invitation and time travel to the party. Sadly, no one but Stephen attended.