The type of jokes made depends on who you're playing with. I've only done one session so far, but clever uses is usually what scored the points for people when we did it. There's some more normal cards in the mix too. It's twice the challenge to do something clever when you have a hand full of nonsense.
Sure it's not for everyone though, so I can respect the choice not to play it. There's plenty of great single player games out there worth playing, and other party games too. I found it to be a crazy kind of fun and a nice break from my otherwise routine day.