Several things trigger a bad mood for me: PMS, hunger, and a lack of chocolate (heaven help the world if all three happen at once). I can usually tell when the cranky takes over because I have angry thoughts that the world is conspiring to ruin my day, e.g. "The people in front of me are walking so slowly just to piss me off." And if the vending machine gets snagged on the last Snickers bar, I think, "Why is this happening to me???"
Yes, I can be a drama queen.
What inspired this post? I'm in month 7 of a 10 month one-on-one language training. Some days my sense of humor is strained past its limit.