Getting out of the shower and realizing there's no towel.
Taking a messy s**t and realizing there's no toilet paper.
People who use "their" and "they're" improperly.
When somebody talks forever, doesn't let you get in a word edgewise, and then thinks you're upset because you're not saying anything.
When you take forever to explain how to do something to somebody, finally get them to understand, and then they go and do the opposite