1) The end of the Harry Potter era.
2) Discussing the benefits of different credit card rewards programs with my friends from high school (sapphire? platinum? venture?).
3) Learning that Felicity is coming out of the American Girl vault (and the sad reality that she's the doll I have).
4) Being called "Ma'am". All the time.
5) Seeing the kids you used to babysit in the grocery store, and then realizing they're in college.
It's a good thing I'm old enough to drink a few of these.