Are you able to surprise yourself with jokes?

I thought everyone was able to do this but apparently not, so I wonder if this is a sign of intelligence or just a vivid imagination.

I notice that I often tell myself jokes, something pops into my mind and I laugh to myself at how funny that joke was.

This also happens when I'm reading theory or history when my brain seems to automatically make connections that surprise me, sometimes it's a connection between facts but often it is a joke.

How is it with you guys, do you often tell yourself jokes that your brain finds novel? How's your 'original thought' meter?