I used to think I was good at minesweeper. I'd play a few hours of it in school every week. Then I found this page, with videos of people playing the game. Now, I realise I am nothing.
If you want to see somebody finish the expert level in 43 seconds, give this page a look.
http://metanoodle.com/minesweeper/videos.html
(you'll need to install the codex at the top of the page before you can see the videos.)