I remember his TV specials.
"Gallagher’s signature bit involved a handmade sledgehammer he called the “Sledge-O-Matic,” which he would use to smash food onstage and spray it onto the audience. His hammer’s trademark victim was the watermelon. Gallagher also became famous for his witty wordplay and sharp observational comedy."
https://variety.com/2022/tv/news/gallagher-dead-comedian-smashing-watermelons-1235430439/
"Gallagher’s signature bit involved a handmade sledgehammer he called the “Sledge-O-Matic,” which he would use to smash food onstage and spray it onto the audience. His hammer’s trademark victim was the watermelon. Gallagher also became famous for his witty wordplay and sharp observational comedy."
https://variety.com/2022/tv/news/gallagher-dead-comedian-smashing-watermelons-1235430439/