You can learn a ton of ninja things with these.

Here is the latest episode but most are pretty awesome.

Battlefield 3 - Myth Busting Episode 6	Small | Large

This is a great find--kudos for bringing it here. The whole series is a pretty great how-to on the stranger possible game mechanics. Just-the-facts; none of the "here watch me rack up a huge KDR while explaining nothing about how I did it" videos that you usually get on youtube.

Tired of people c4'ing your ride? Just mount some claymores on its side.

You can run people over with the eod robot.

And more! Check 'em out from Booms' link.