My group once stumbled into the boss room to find the boss chilling with what seemed to be clones of the whole party. Since half the group knew i could probably play their characters better than they could, they sort of freaked out.
...then the Paladin's player had an emergency and made the whole group wait an hour....staring at their clones across the room. Oddly enough no one figured to do a check or something to see if they were real. So they spent the whole hour trying to figure out how to most effectively kill themselves when they were truly nothing but crude copies.