My favorite thing to say at a social gathering when the conversation suddenly dives into an uncomfortable silence is, "Yeah, and so then she said, 'That's not my arm.'" The beauty of this phrase is that it's so random that most people are completely caught off-guard by it. Depending on how you inflect it, the sentance can have a totally different meaning every time. Another good opertunity to use this is when you are talking to a devious friend while walking somewhere, and just as you pass a group of total strangers, you let that phrase slip out of your mouth so that they can hear you just fine. You can get some really fun reactions from people. Or you can use it as a psychological test to see how perverted the people that you're talking to are.