What about the nasties?

[Tony Wheeler]

Originally Posted by Phil Waterman

You sit up quickly, of course, and wail your head into the drive shaft.

....or the gearbox drain plug. Rather more pointy and makes a nasty scraping sound on your skull, which seems to echo in your ears as you roll around clutching your head. And you may need to take a selfie to inspect the damage - turns out you can't see the top of your own head in the mirror. This was taken the following day after it wouldn't stop leaking and I thought it might need stitches. However I can't blame this one on chipmunks, it was entirely self inflicted!