A while ago, British TV show Swag (by Madonna's hubbie Guy Ritchie, btw) staged a trap for would-be thieves. They parked a cargo truck with its door open, revealing a tempting assortment of goodies inside. When the bandit went in for a quick steal, they closed the door and unravelled the cargo truck's covering to reveal a mobile cage!
Hit play or go to Link [YouTube] - Thanks wade7!
Here's another example: Thief trapped behind a security glass door after attempting to steal toilet paper in Redfern, Australia.
http://www.youtube.com/watch?v=QB8fTIsIG6Q
Quality isn't great though, but at least you can get the idea.
Some legal complication, perhaps?