Have you tried.. kicking it?!

A friend of mine's custom built PC had a clear side so you could see into it. One of the side fans had quit working. I assumed that it would be due to hair getting into the blades (friend had long hair and didn't clean his room much), but to my surprise that wasn't the issue.

As I stood there figuring out what I should check next (the wires were good), he said 'it has done this before and this usually fixes is..' and then he proceeded to kick his case! Sure enough, the fan began spinning..

I do not repair computers for a living, and this happened years ago, but I had never really encountered 'kick it' as a viable response before. Also, well, I thought you all might get a 'kick' out of it. If you are worried about my friend's PC, he got a new one about a year later.