Do they give merit badges in dumbassery?

Right, so the Check Engine Light Of Dooooom came on in my car as I was driving home from work today. Like a Good and Responsible Adult I took it right in to the service station. They identified the problem pretty quickly:

I'd left my gas cap off.

In my defense? The Check Engine Light of Dooooom came on about a week ago because something had come loose after an oil change. And I last got gas Monday -- how was I suppose to connect the two events?!

I'm pretty sure the mechanics think I'm not quite right in the head now. I could see the pity in their eyes.

Such is my life.