If you play video games, or would like to but don't because you have an older PC or don't wanna spend the money, Killing Floor is $5 on Steam this week.
It's a fantastic game and is continually being updated with new maps and weapons entirely free. Even after being out for over 3 years. And because it is so old, it is not too demanding and does not require an insane graphics card.
One warning: the monsters can be pretty scary so you would not want to get this for a young kid. If you set it on easy, the game is not scary and just super fun with some gore. If you set it to a harder difficulty, it will scare the pants off you, or at least it still does for me after 3 years.
Try it! Even if you don't like it, it was only $5!