Part of my fondness for this is the experience of sharing it with my son, quoting bits to each other, but I hope many of them could raise a smile even in a jaded adult.
It's a wonderful medley of very short poems ("There are holes in the sky where the rain gets in, But they're ever so small, that's why rain is thin.") to longer ones such as On the Ning Nang Nong, and also a couple of bizarre funny stories (several short chapters each): The Bald Twit Lion and the hapless knight, Sir Nobonk.
And the illustrations are a delight as well.