Q: Why did the child cross the playground?
A: To get to the other slide!

Explanation: Back in 2013, the first joke that I explained was, perhaps, the most famous of all jokes–Why did the chicken cross the road?  This joke is funny because it plays with that joke.

The answer to the chicken-crossing-the-road joke is “to get to the other side.” This joke plays with that joke by using a different, rhyming word for the last word of the answer, slide.  And it also makes sense that a child would cross the playground to get to a slide.  People cross all sorts of things to get somewhere: they cross the ocean, they cross the mountains, they cross the desert.

Now here is a slide I might cross the playground for: