People who like Seinfeld, Jay Leno, Howard Stern and laugh track sitcoms deserve a fucking kick in the temple. Those shows repeat themselves so much it feels like you're trapped in a vortex of suck.
As for not finding things funny, I've never really liked the UK Whose Line, Benny Hill, Crank Yankers, the Blue Collar guys(except Ron White- he rules), SNL nowadays, as well as everything mentioned above.