-Running out of milk and food.
-Wanting something I can't obtain due to lack of money.
-When people treat me like an outcast.
-Being unemployed.
-Plans that are made then can't be fulfilled due to some petty reason/excuse.
-Other people's shitty moods.
-Bad news of someone dieing.

Things like when my stomache hurts also effects my mood.. the pain gets worse by just looking/listening at/to something I dislike.