Virtually all of DSs many attempts fall flat, such as:
Why did the bird eat the other seed?
Because he went the wrong way. (much giggling)
I sit there wondering if I'm missing some deep insight until I conclude, no, that despite him repeating the "joke" 10 times it still doesn't actually fall in the category of humorous. I wonder if in his head he sees some image that's funny? I don't know why he giggles.
Polly
The visual thing creeps in a lot.
Mr W has been learning all the referee arm signals for American Football.
I.e, first down, incomplete, offsides, etc.
The first one he learned was Touchdown.
This weekend, we asked him to do touchdown, and instead of lifting his hands over his head, he squatted down and touched the floor.
Then he laughed hysterically.