While it may not actually be this often, it seems like I buy printer paper at least once a month, if not more often. I bring said paper home and refill my empty paper tray in my printer then go on my merry way.
I don't remember ever re-filling the paper tray, but the next time the printer is out of paper, the remainder of the reem I recently purchased is nowhere to be found. I've no idea if others in the house are printing mass quantities of stuff, or if paper gnomes are stealing the paper. All I know is that tne next time the printer needs paper, I can't find it anywhere I look.
I have this fear that if/when we ever move from this house, I'm going to find a few thousand partially used reems of printer paper stashed EVERYWHERE. I can't find them now, but I've no doubt I'll find them when I least expect or want it.