Yup, ya gotta be careful. I used the copier at work a while back. When I pushed the button, the copier spat out a copy of a co-workers personal check. She must have copied it, taken all her stuff, then for some reason the machine held it in memory thinking another copy was needed, and when I came along and pushed the button... out came the second copy (I gave it to our HR person).
Sometimes I'm not too fond of these new copiers, too many functions, too confusing, too easy to make a mistake. Make sure there's no additional copies in the que if you copy your own stuff (usually some light's flashing on the control panel?).