1. You know them but they might not remember you, but they also might, so when you see them you awkwardly smile at them
2. You both actually know each other, so when you pass each other you smile and wave
3. When they say hi to you but you have no idea who they are so you just stand their questioning how you know them
4. You see them but they don’t see you, so you yell their name to get their attention so you can say hi
5. You walk right up to them and don’t even say hi, you just start complaining about life
6. Grab, smack, or kick their butt
7. Literally throw yourself on top of them, scaring them
8. Give them a dirty look and/or call them an insulting name but y’all know you love each other so it’s cool
9. You see them sitting, don’t even say hi or anything, you just join them while going on with your business until one of you thinks of something you want to talk about