There's a new service ComedySportz is now offering. It’s called John Russell Terrier.   If you’re like most of his fans, you probably want to laugh more fully but don’t think anything will really work. Maybe you’ve tried some of the shows advertised on TV or over-the-counter laughter kits, only to find they didn’t do what they claimed. That’s because these over-the-counter laughter kits use a weaker humor agent and can’t give the results this new breakthrough John Russell Terrier does.