Yeah, making yourself laugh is really hard but I know a totally good joke. Maybe it'll work.

[She may have messed this joke up before, but this time she's got it.]

What did the magician say to the fisherman?

[There's a pause before she writes the rest.]

Pick a bass, any bass! trout minnow Nevermind. It would probably help to look for a joke book or something in the library.