Was at the parts store today (spend alot of time there lately) and the guy in front of me is wanting to buy 1 spark plug for his 04 explorer. Guy asks him why just 1, and he tells him because when his mechanic fixes it he only replaces one plug at a time. I ask him when was the last tune up and he says his mechanic told him tune ups were a waste of money. I then ask how much he gets charged to replace 1 spark plug, and he says it's about $100, there were 3 mechanics in the place and all of them started laughing. I told him to find a different place as he wasn't going to anyone that should touch a car. Why are people so stupid they can't see a rip off?