Q: What did the ol’ pirate say on his birthday?
A: Aye, matey!

Explanation: Happy birthday, matey, and have some cake!  “Matey” means pal or friend.

Ol’ means old; the apostrophe (‘) replaces the ‘d’ in old just like the apostrophe replaces the ‘o’ in didn’t (did not).

This joke is funny because of the sounds.  If you say “Aye, matey” slowly, it sounds like “I’m eighty (80).”  Pirates say things like, “Aye, matey.”  To hear some more things that pirates say you can watch this video, talk-like-a-pirate video, matey.