Not horse related, but people who try to get onto elevators before letting the people wanting to exit the elevator off.
Oh, and people who proceed to play loud music and jump around on the floor above you late at night. I'm sorry, I thought quiet time started at 10 pm, and it's now 11:30 pm. My mistake for 1) thinking that quiet time actually meant quiet time and 2) trying to go to bed "early" (11 pm) because I have to get up at 5 am for five days in a row each week. My bad for the misunderstanding.
"And somewhere in the northwoods darkness a creature walks upright. And the best advice you may ever get is: Don't go out at night..."