Push someone down the stairs
It's the weekend. There's no hockey. Football season is over. There's no baseball. It's too cold to go outside. If you leave the computer, you'll feel obligated to do something constructive.
Screw that. Go grab yourself some free games, and heap abuse on a virtual crash test dummy. The dismount series of games first came into being with Porrasturvat. A game where you have a basic stick figure, and push him down the stairs. Sounds simple. It's also incredibly addictive. A while later, there was a version where you crashed a truck with the same guy in it.
Now the new version is out. And it's moddable! So go wreak virtual havoc on some poor little CG man. You know you want too. Then create some mods!