Anons, you disappoint me with your lack of creativity.
If you want to fuck with a restaurant, order 10,000 or so cockroaches from an entomology supply house. Either have it delivered to the restaurant, or take it yourself, open it up, and toss it in the door.
Escape plan should be well rehearsed and a disguise that looks real, like wig, glasses, makeup, the whole nine yards.
Not that I would advocate that, what with it being illegal and all.