The Danish Federation of Cyclists have found that cyclists associate their mode of transport with happiness more than bus passengers, train passengers or car drivers. This is from the Cycling Embassy of Denmark, a network of private companies, local authorities and non-governmental organizations working to encourage cycling. It is based in the office of the Danish Cycling Federation in Copenhagen (of course that won't influence their conclusions in any way).
This afternoon I am not going to take the bus or the car for the four miles to Cookham - I will spread a little happiness instead.
Update: I thoroughly enjoyed my brief ride to Cookham (and got some productive work done when I got there). On my way out I passed our neighbour's daughter practising on her bike. It was her second outing without stabilisers. She has quickly mastered it, was having a whale of a time, and setting a pretty high standard for spreading happiness on a bike.