Recommend me some games with the simplest multiplayer gameplay

[snyps]

If you know of any simple multiplayer games that you and a friend have truly enjoyed, post it here. I’m trying to get a compilation going for if there’s ever a room of non gamers (like a family gathering) to have a reason to pick up and play. 

I’m thinking along the lines of games like this:

Pong

Wii Play Tanks

Wii Play Hockey

So to be clear, it must be:

1. Pick-up-and-play. No thinking required  

2. Specific game (if it’s within a compilation)

3. Addictively competitive or cooperative. 

Please lmk your recommendations.