My top 5
Yes, I am talking about video games...
1. Halo (have not finished campaign for halo 4 yet, I really hope to soon... but I really liked reach)
2. World of Warcraft (amazing game and easy to interact with people)
3. Assassins Creed (Utterly amazing game, great storyline)
4. Black OPs (I have a weakness for zombies)
5. Starcraft II (fun game if your good at strategy)
This is a hard list to choose, the numbers are slightly interchangeable (especially 1 & 2). Another that may just make this list is Runescape. It is a fun game to fool around with and no charge to play.