There's something really special about the moment you realize you're an adult - suddenly it just clicks that you're a fully functioning human being who has real-person responsibilities. For some, that moment happens when they turn 18 and their parents kick them out of the house. For others, it happens when they're 30 years old and they realize they'd rather just go to bed early on a Friday night over going out to the bars with friends. The following people are tweeting about the moment they knew they had just bought a one-way ticket to adulthood and it's simultaneously sad and hilarious.