My printer.
I only seem to use it once every two or three years, and each and every time it's the same scenario...
My PC cannot connect to the printer. The printer can find wifi connections halfway down the street, but not the one a few feet away from it. Shouting at the printer doesn't work (although i try this first every time). Turning the wifi off and on doesn't work. Uninstalling the printer and reinstalling the software does work... but why do i have to this every time i want to use my fecking printer??