I actually remeber an instance of me having to drive whilst pissed.
Back in 1983 I was the manager of a shop in Northwich, Cheshire, and obviously, the main key holder.
One of my dickhead staff forgot to lock the front door the previous evening (my day off), and plod were doing their rounds at 3am and found the door unlocked, and consequently rang me to come and secure it.
I lived in Frodsham at the time, and had the moral dilema of deciding wheather to drive out there knowing I was over the limit, or facing the full wroth of the management the next day if anything was nicked, with the possibility of being sacked even.
I took the chance and drove there and back without seeing a soul ...fortunately.
Wonder what would have happened if plod had been waiting for me and sniffed me breath?