Quickly searching something on Wikipedia. Wiki Quickies are particularly useful when talking about a challenging subject online or over the phone. A quick glance at the Wikipedia page pertaining to your subject will easily and discretely give you the upper-hand in a debate, or will simply make you look smarter.
Person #1: (while putting away laptop or iPhone) "Did you know that the smallest house in the world is only 5.49 square meters in size?"
Person #2: "Woah! I had know idea. How did you know that?"
Person #1: "Wiki quickie, baby!!"