Dubai yesterday hosted a stunt dubbed the world's most expensive billboard, featuring a man flying around a poster ad wearing a jetpack.
The excercise was a promotion for Skydive Dubai in association with Go Fast, maker of energy drinks.
Kept up for a month, the ad would have cost approximately $1.3 billion (it's $500 a second). It actually lasted less than a minute. You can see the action [here](http://www.youtube.com/watch?v=-ptr5gyLwq8).
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