Fishing Joke/pun. Can I Copyright This

Im a city slicker whos gone fishing 3 years now with a so called expert fisherman to the same lake. In 3 years we have caught Nothing.

Last day of our 6 day trip, we are packing up to leave. My friend Tom turns to me and says " So, you want to out for a small troll." I said, "No. but I will go out for a big trout."

Can I copyright this.