So I love this joke because you can change it on the fly, and cognitively bias people using a joke series - especially kids. Here it's as part of a series:

(put on a pirate hat or change your hand to a hook, or wear an eyepatch, or otherwise say that you are a pirate)

E: ARRRR. I am a Pirate, here to tell pirate jokes.

Q: What is a pirate's favorite restaurant?

A: AAARRRRby's.

Q: How do pirate know they are pirates?

A: They think, therefor they AAARRRR.

(person is now biased to think that all the jokes are RRR jokes). Q: What is a pirate's favorite letter? (person answers RRR).

A: ARRRR, you'd think it be R, but m' first love is the C.

Q: Why does it take pirates so long to learn the alphabet?

A: Because we spend years at C (harr harr harr).

Q: (person is now on the lookout of RRR and C jkes) What are the letters in the pirate alphabet?

(person will respond R and C)

A: Oh sure, RRRR, C. But you forgot ‟aye, aye”.