Several years ago, I was looking for car insurance on the Norwich Union Direct site. The premium came up at about £250 then I noticed that if I kept on filling the proposal form out with the same details, the premium kept on getting lower. Eventually it went to £0 so I hit the "Pay Now" button.... Policy ducuments arrived a few days later, then I got a phone call saying there had obviously been a mistake and the premium should be £250. I reminded them that as they were members of the Which Web Traders Association, they had to honour prices shown on their web site. Don't know why, but they actually charged my credit card with 2p, wasn't worth the cost of a stamp or phone call to complain about that, so 1 year's insurance for 2p.
Dave.