So I am probably overreacting.
But pet peeve of the day is when you have been in a class for...hmmm 10 weeks or so and you always sit in the same seat. Then one day, some person decides that they want to sit there. Not only do they take your seat, but they also "save" all the seats around it so you cannot even sit in the general area...LAME.
C'mon guys, really? Flow is flow, and you are messin' with it.