This stunt reminds me of a couple of radio bits and television bits from the past.

The first one it reminds me of is when Dan Collins had Scotty Collins (formally of the Breakfast) head to a restroom in a public restroom.  Scotty then proceeded to make it 'sound like' he was visiting with the person who was 'using' the stall next to him.  It was really very funny. It takes a quick wit to pull off a stunt like he did that day. People still talk about it.

It also reminds me of some of the old Candid Camera shows where they had the 'secret camera' out and about catching unsuspecting people, doing very funny things.

It's a funny bit, but something tells me it would be a good way to get your butt kicked too.  Enjoy!