I saw a thread just like this on Bikeradar.com and thought we could use a similar one. So post your videos of as the title says: "Smart-Arses Getting Their Comeuppance".

Here are a few good ones i pulled from the site mentioned above in the first few pages of the topic.

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& my favourite one:

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The guy tries to nail a kid riding his bike with his car door but karma catches up with him. Pure comedy gold

Note: I put this on both Newcastle cycling forums as i don't know which one most people are viewing.