I hate printers, but I downright loathe copiers. Photocopiers achieved sentience about 15 years ago, when they became smart enough to figure out how foul up our work at the worst possible moment. They do it on purpose.
Five minutes to get something to the courthouse? Paper jam!
Need to scan a critical document to get it filed by a 5:00 deadline and it's 4:57? "Please clean the scanning lens."
Why am I the only person in an office of nearly a hundred who runs out the toner cartridge?