Driving far too slow. 5mph everywhere! Holding up everybody everytime you're out on the roads.
On a positive note, if I had a tubby bloke in a top-hat dawdling in front of me, I'd be tempted to nudge him with the front of the car. Good self control there.
Just pulled out of a gas-station in front of 50mph traffic, whilst towing a digger too. Almost caused an accident. Then refused to get up to speed...