Said, "Like, he's/she's so totally cool/hot/phat/lame/gorgeous, like!"

Pledged the flag.

Wear a high school class ring.

I find that 40% stat difficult to believe.

All kinds of weird ideas on the 1/3.... so how about 'participated in a team sport'.

Use algebra.

written an exam.

danced

gotten a report card

attended a sporting event

Visited said high school.

Smoked

I didn't go back to my high school until 30 years after I'd graduated. Hadn't changed at all. Not one bit! Wouldn't have set foot in it, except my son marches with their band. He attends another high school for his academics. It is really weird to go back!

Sigh. Read a book.

Math calculations in their head