"Jokes are fun," says H

H has started telling riddles (making some up herself, I think):

"What goes vroom vroom, but is not a car?"
"A motorcycle"

"What blows, but is not the wind?"
"A kitchen fan."

"What neighs, but is not a horse?
"A pony."

"What has 4 wheels and flies?"
"A garbage truck." ----- This one she got from an episode of "The Electric Company".