We had a tech that worked for Zenith for 30+ Years and he told a story about a supervisor that had a habit of coming over and picking things up off his bench and walking off with it. So one day he charged up a cap and placed it in reach and sure enough the supervisor came along and picked it up! ;-)
Needless to say he got his hair curled.
Another good trick is to glue a quarter to the floor and watch as someone tries to pick it up.
In the old days when metal lunch pails were common, you could take Epoxy and glue the lids shut. ;-)
