Munchkin

I discovered this game last years, and it is AWESOME!
It is a game where you get to stab your buddy in the back, fight monsters, get treasure, and all without the weird dice or characters of other games, such as Dungeons and Dragons.

Everyone starts as a level-one human with no class. (Heh, heh)

In your hand, you get four treasure cards and four door cards

The picture shows an example of treasure cards. Other treasure cards include level-ups and other helpful stuff.

The other cards include monsters, races (dwarf, elf, gnome, orc), classes (thief, warrior, bard), with each thing giving you special talents. For example, if I was a dwarf warrior, I can do certain things that a human cannot.
Another thing that the door cards have is that they can give you certain cards that help you stab people in the back.

Still confused? Here's a rigged demo.

Want to buy the game now? It's on sale on Amazon, right now it is $17.30

The best part is, there are ENDLESS expansions to Munchkin, and it can become a pretty long game. For instance, my dad got Star Munchkin for his birthday.