My biggest PP is when people pat me on the head. I'm very short (like the size of your typical 6-7 year old) and people think that since my head is right about the same height as their hands, it's ok to do to me what you do to kids. I'm an adult...don't touch my head. Ever. I've been known to tell people to stop.
My next PP is when people live upstairs in an apartment and think it's ok to let their kids jump off of the furniture & totally disturb the people downstairs. I know I live in an apt and expect to have some noise, but trust me when I say this is excessive. I actually had to talk to these people once & the woman told me she tells her kids to stop but the don't listen to her.