The smoking thing definitely, also management not being strict enough with members of staff who are being completely useless.

I used to work with this one girl who always phoned in sick or for ridiculous reasons, would come into work completely wasted, used to have domestics with her husband on the phone, speak to her friends on the work phone for literally hours, spend most of the afternoon at the back door smoking, being agressive all of the time and it was all passed over - the management were totally aware of this.

One day a completely untrue rumour spread that I was talking about her and I came in to have her corner me and threaten me, which i obviously complained about and resulted in her getting fired..... I was so annoyed because she'd been doing fire-able offences for years but it all landed on my head when it happened, and she still walks past me in the street shouting abuse. She is a complete and utter nutcase and I was so angry with my job for not firing her sooner and letting me take the full fall for it.

Sorry for the essay but that is my biggest ever pet hate - so unfair.