When people don't cover their mouths when they cough or sneeze.
When people (usually girls) complain about it being cold yet dress like it's summer.
When people smile all the time about nothing.
When people mock an ability they don't have themselves.
When people don't wash their hands after using the restroom.
When a parent or parents bring a very young child (usually an infant) to a movie and refuse to take them out when they cry.
When people get mad if you look at them but they keep looking at you to make sure you're not looking at them.
When groups of people walk slow in front of me.
When I'm wrong about something or don't know something and they react as if it were the first time.