I’m baffled by this because I think it’s funny - it’s why did the chicken cross the road, but with added absurdity. To me I’d be like “wow that 4 year old put a twist on the old chicken joke, nice work you hilarious child”.

it's funny because I know it came from a 4-year old :) If an adult said it it could also be funny because they are saying a child-like joke as meta-humor.