Gallagher became a household name in the eighties by smashing watermelons with a giant mallet and for a while he was appearing everywhere including commercials. In this 1985 ad for Budweiser, he demonstrates how easy it is to bowl, if you just use a watermelon instead of a bowling ball.
I remember watching Gallagher’s HBO special with my Mom after hearing raves about it from my friends. Afterwards I asked her why people thought smashing watermelons was so funny. She did not have an answer to that.