I know a few people who ignore the fact of changing their timing belt on time. They do not care and also they do not know that this might cause a great disaster if they do not change it on time. I did not know that myself too. But a few weeks back my timing belt was not working and I took my car to a mechanic shop and they said that I did a good deed for turning my car to service before it was to late. That is why people owning cars should take this thing more seriously.