Is Great Britain ready for "Stupid Pet Tricks"? David Letterman will find out when he broadcasts his NBC late-night show from London in May. Letterman & Co. will stage four shows at the Victoria Palace Theatre, May 3-6. Letterman producer Bob Morton said the shows will be similar to those taped in New York but will draw primarily on British comedians, actors and musicians "as well as everyday guests." "Late Night With David Letterman" has been seen weekly on Great Britain's Channel 4 network since November.