Traffic Jams :Being stuck on the A404 between Marlow and High Wycombe for an hour and a half due to the M40 being closed 
Dogs : When we finally got to our destination I was in a car park and had a rear door open whilst getting something. A dog which had come back from a walk in the woods with mud everywhere decides to jump in the car and walk over the back seat leaving a dreadful mess and scratching the leather seats with its paws 
Dog Owners : Upon telling the owner of said dog what had happened and suggesting that it should be under better control, the owner replied that she was perfectly capable of looking after her own dog and how dare we suggest otherwise. Stupid bint 
There. I feel better now.