What is the best thing to bring to a party?

Now I don’t mean alcohol, drugs, or music (lets assume you already have those there). But what’s some great items to bring to any party for maximum fun?

So far I’ve got

* helium balloons – sounds childish but trust me when your all hammered and someone takes a hit of helium and starts singing its a great damn time.

* roman candles(the firework) – I’m not going to tell you to shoot these at your friends but a roman candle duel is always fun as hell.

I’m kind of lacking on ideas here, I’ve used both of these. Feel free to use them and drop your cool ideas for everyone else to have a blast with.

EDIT: this may be the wrong sub for this, if you have a better one let me know!