If you're a regular patron of the internet, then you may have at one point met somebody which, previous to doing so, you formed an opinion on and then when you met them found them to be different. It's not that people purposefully try to deceive you... truth is stranger than fiction.
So in this thread, predict that difference for yourself. If we met you, what would we be surprised to find?
For myself (and this is backed up by feedback from people who have actually met me) you'd find that I'm not very intellectual or speak with particularly high degree of intelligence (only sometimes on purpose).