Oh hell yes
Got a few scars from this exact scenario my self.
My other favorite? Can you fix this and I'll be leaving in ten minutes but I'll leave my computer on.
When it's something that requires them to be logged in on their account. The ones we don't have passwords too. (oh we could change them, but sometimes the users disappears for hours or even days and then will phone in unable to log in... while we're working some new fire that needs putting out)