Let’s start with something fun: Why don’t aliens eat clowns?
Because they taste funny.
It’s a joke, but there is someone who claimed to have done his PhD on this topic (Source: blackhat-lounge). What can we say, some people are just too serious? No, jokes teach us something, depending on how we look at them.
Another one: Why is six afraid of seven?
Because seven eight nine.
It’s a silly joke, you bet. But, I use this joke to teach young children phonics and numbers. Guess what? They learn fast and remember better than anything else. I also use Candy Crush Saga to teach colours.