I think it’s a great move on the creators’ part. Building silly stuff like that into Siri creates massive amounts of goodwill. That will make it much harder to really hate Siri when it – inevitably – screws up sometimes.
I never tried it this extensively, but it would tell jokes and such, certainly. I once tried "how much wood would a woodchuck chuck if a woodchuck could chuck wood?" and it gave me a list of local lumberyards.
I think it’s a great move on the creators’ part. Building silly stuff like that into Siri creates massive amounts of goodwill. That will make it much harder to really hate Siri when it – inevitably – screws up sometimes.