The question "Why did the duck cross the road?" is a classic way to set up a joke. The usual funny answer plays with words or adds an unexpected twist.
Here are a few usually playful responses:
"To get to the other quack-tastic side!"
"Because it heard there was a pond on the other side."
"To prove it wasn't chicken!"
"Why not? It wanted to wing it!"
"To see what the humans were always so 'egg-cited' about."
The humor in these responses often comes from wordplay, puns, or a bit of silliness, aiming to make people smile or laugh.