I hate it when... I do bar and customers are "backseat" baristas... is that non fat? is that decaf? Are you *sure* that's soy in that latte?
I hate it when... people come to my register and don't have their money ready. Or even worse, they left their wallet in their car and have to go back and get it and they hold up your line while people give you dirty looks
I hate it when... managers give you a hard time about being 2-3 minutes late, even though you constantly cover shifts and do extra cleaning for them all the time
I hate it when... the school down the street has a "surprise" soccer tournament on a warm spring day, and it's only you and 1 other partner on the floor because of labor cuts.
I hate it when... you're a shift and you caught the cold from hell and there's NO ONE available to cover you, even though you've called practically every store in your state. So you end up having to go to work and bust your **** and make drinks with no voice from coughing all nite, a fever of 101 and a sore throat.