Even the most humdrum activities can increase the potential for rage. At our little suburban station, there are just two trains an hour in each direction, so it's particularly enraging when somebody decides that one minute before the 10.27 leaves is the perfect time to fill in a form, buy a Network Card plus a ticket to Milton Keynes, and pay for the lot by credit card. There are an awful lot of thoughtless people about. On a train I once boldly asked some young neanderthal to take his muddy boots off the seat in front. He didn't demur, but gave me a long and mystified look.
Smokers can be another source of rage.
Before I quit smoking, I promised myself I'd never become an anti-smoking bore. Somebody told them that by smoking they were defying the nanny state and striking a blow for rugged individual freedom. So they light up with all the self-conscious pride of Joan of Arc hoisting her banner against the English. I once remonstrated with a man who'd manoeuvred enough provisions into the express lane to cater for the D-Day landings. Well yes, actually.