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The best one I've seen yet is the twitter background for Salesforce's Desk.com

If you look for more than a second, you realize nothing, absolutely nothing about it makes sense. It's insane.

I've been staring at that for 5 minutes and I can't for the life of me see what doesn't make sense. What doesn't make sense?!

Probably the lack of power going to the iMacs, which could also explain why they have to use their mobile devices instead... :)