Google gets owned, though I would have to :)
TechCrunch has an interesting story up about Google here. It has profanity in it but it’s upside down so it must have the opposite effect. 
˙looɔ ʎʇʇǝɹd ʇɐɥʇ ʇ,usı
What this is a perfect example of is that you can never trust the data given to you by the client, EVER! Unfortunately most people don’t know that this was even possible (including myself until I saw this.) Now while being able to put in upside down text may not seem like a huge issue this can allow things to get around filters that were setup (say for profanity) or possibly allow for injection type attacks.
So this is just something good to know is out there as a possibility, cause we all know “knowing is half the battle!”