It might be difficult to tell, but often I've had a go at being a funny person... nobody's laughed, but I also haven't had any tomatoes pelted at me yet, so I assume I'm not doing anything too bad yet... I assume Funnyman felt the same way when his 6 issue run ended,
Larry Davis (no relation to Larry David) was a comedian who wanted to do this cool publicity stunt where he dressed up like a clown and stopped an actor playing a criminal with all his funny props - basically making himself a superhero version of Carrot Top... except, when the day came, he ended up actually stopping a real criminal! This worked out well enough that Larry decided to keep up the crime-fighting, much to the dismay of Sgt. Harrigan as well as two other clown-themed heroes, Comicman and Laffman.
As I mentioned earlier, this character had a 6 issue run as well as a comic strip before fading into obscurity, along with its creators... Jerry Siegel and Joe Shuster? The Supermen guys?
Yep, the Supermen guys. Funnyman (along with the publisher "Magazine Enterprises"... really creative, guys) came about when Siegel and Shuster left DC Comics (at the time National Comics) due to not being paid well. They also tried to sue them so they could get back the rights to Superman but, that didn't go over too well. They needed a new hero, one to grip the nation like Superman did. Their solution? Funnyman.
Yeah, don't make clown-themed superheroes, it doesn't go well usually.
In a slightly ironic twist of fate, Larry Davis eventually made his way back to DC as a cameo in Super Friends #5.