Gallagher’s signature sketch is a pitch for the “Sledge-O-Matic,” a large wooden mallet that he uses to smash a variety of food items and other objects, culminating with a watermelon. Sure, he’s the famous watermelon smasher. Yes, he literally INVENTED the television stand-up comedy special. Absolutely, 14 Showtime specials is a big deal. And certainly 3,500 live shows to capacity crowds is worth mentioning.