Recently at work I had to give the system 4 questions (from a list) and the answers. The common complaint among the fellow-sufferers was "I'll never remember the answers to general questions like that". Then it occurred to me (I am quite slow, I admit) that the computer wouldn't know if the answers were true, so I had great fun giving silly answers to silly questions, but at least remembered to write them down so that if I'm ever asked, I can find what I said. (Assuming I can find the list...) 
The other day I wanted to try a possibly lucky number on a Yeo Valley yogurt carton, but lost the will to do it when I had to register first. Can't be bothered.