I can't remember whether it's apocryphal or whether it actually happened at my company, but the classic one of these is the internal office email with the subject line "The stationary cupboard has moved" :-)

"Do you sell Stationery?"

"No, sometimes I move about a bit".

Boom Boom.

There's a stationery factory just outside Sawston which we drive by sometimes, and I like to imagine a misspelling on the sign leading to it driving off in disgust. It's by the railway, so I imagine it would become long and thin and trainlike.