We all have hobbies. Some people golf. Some people fish. Some people hunt. Some people collect stamps. Some people cook (a GREAT hobby to have in my opinion. Sometimes I wish I had time to take that up. Be entertained AND get delicious food? That's just a win for everyone).
What's my hobby? I go back and re-watch old Chiefs games, both broadcast version and All-22. Sometimes I take notes. It's a ball, I'm telling you.
Why that as a hobby? It's cheap, it's easy, and it's something I can do while still at least pretending to help my wife with the kids (or pretending to work when I'm supposed to be .