Quizzical Question: Bored, bored, bored...what do you do?

Have you ever had one of those days where you are just bored and nothing sounds like fun? That seems to be the majority of my days lately. I come home from work at night tired, worn out and bored. I have plenty that I could be doing but nothing that usually sounds like fun, is fun anymore. Help please... I need to know, What do you do when the fun things that you used to enjoy doing just aren't fun anymore? Or maybe I need some fun ideas, What do you do for fun?