My last 15 minutes as a 23 y/o!!
It's not my birthday, but a scary-looking man with a crowbar just broke into my house.
Scary Intruder
Explanation
Explain Bear
Alright listen up, nimrod. The joke is that the person thinks they're about to turn 24, but really they're just about to get clobbered by some dude with a crowbar. Get it? You wouldn't because you unironically use the term "y/o".