What is Fun?

My daughters have fun.

Nuns have fun.

Why aren't we having some fun?

My elspouso and I are on the quest to have more fun. I remember having fun. It is fun to have fun. But, as we have gotten older, fun seems to be a bit too much trouble... and often just out of reach of the chair. So we are going to get out of the chairs and back into the fun. Now we have to remember what that is and go find it. Any ideas?