Fight your ex best friend day no matter what you think will happen. You will get your revenge on them (unless you’re the reason you are ex best friends). And you will be the most amazing person the world has ever seen.
May 4th is National Armpit Luke Day where if you have a friend named Luke you have to shove your pointer finger up their armpit and yell the word "armpit."
You: "Hey, Luke. It's May 4th!" Luke: "NOOOOOO" You: "ARMPITTTTTT"