Inspired by Lucas' comment...
"Someone will always know something that you don't know, because everyone has a different perspective."
I think that's why I love computers, you'll never know everything there is to know and in any moment someone can appear in your life and tell you something you never heard before.
...what's your computing / programming cocktail party fact? Meaning, what's a cool conversation starter or bit of trivia that you know about programming or computer science? Here's mine:
Linux, in addition to being one of the world's most popular operating systems, is also a brand of detergent in Switzerland!