[lukevanoort]

Adding on,
ALLEN WRENCH: A tool used to turn hex-shaped holes on the end of screws into round holes. Beware, these wrenches are shy, and tend hide in dark, hard-to-reach areas; steel versions are particularly attracted to the underside of electric motor cases (due to not-yet-described physics phenomena, this attraction is greatly strengthened when you only have one Allen wrench of a particular size).

(Yes, this actually happened, one of our members spent at least 15mins looking for a specific (I think it was metric) Allen wrench that he had been using. It was discovered stuck on the underside of one of our drive chiaphuas.)