Tell a joke. Telling a joke at the wrong time can blow your "social cred" right out of the water and leave you looking awkward. Yet, telling one at just the right time, with just the right tone can smooth over even the most tense moment.
- Get a feel for the situation. If things are a little heavy, the perfect joke can lighten the mood. But if people are having a really serious discussion like discussing the deaths of their grandparents, then you should back off with the humor until the tone of the conversation changes a bit.