What kids' jokes (5 - 10yo) have made you chuckle as a parent?!

What kids' jokes (5 - 10yo) have made you chuckle as a parent?

My daughter's 25 now but I still remember the day she came home from school 20 years ago and asked my missus and me why squirrels swim on their backs. We thought it was something she was learning at school so we encouraged her to answer for us.
"To keep their nuts dry," she said. Completely straight-faced.

We had to leave the room before we gave vent... Anyone else had similar?

My sister when 8 almost gave my father a heart attack at the dinner table when she asked 'What's the difference between snowmen and snow-women' The answer being of course - Snow balls. This was back in the early 60s and probably had more impact than it would today :)

My own daughter got a birthday card from a wee boy in her class for her 8th birthday. On the front it read 'It's hard to be good'. Inside it said 'And believe me it's got to be hard to be good'. I had to display it with the rest of her cards!