Put a mask on the employees face with duct tape over nose and mouth. Poke one hole where one of the nostrils is
If you mis-locate the hole, no big deal. You will still get a participation award.
Besides, the resultant reaction can be vastly entertaining.
It's not as if these monsters are people. If it can't imagine why it shouldn't have taped a mask to a child, it might learn. Dogs learn, and they aren't much brighter than teachers.