What are some really fun apps?

I don't like game apps, I like the random apps that are really fun to use at the perfect time. Like for example, the Bleep Button, iLightr, Mood Finger Scan, IFlashlight, or even things like truth or dare and charades. I like apps that are fun to use when your at parties with a lot of people or just with a group a friends, not games. What are some really good ones?