Wavelength

You try to read your teammates minds on a hidden spectrum. You draw a card with two opposing concepts like hot and cold or sad and happy. You give a single clue and your team has to turn a dial to where they think it falls on that spectrum. The discussions among the guessing team are usually hilarious. It prompts a lot of weird philosophical debates about random topics. It takes thirty seconds to explain and works with very large groups. A fantastic social experience.