Pick (almost) EVERY Type of Lock

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It's not really every type of lock but it is a lot of them and the information density in this video is very high. I've seen explanations for how to pick standard pin tumbler locks before, but this explains so many more types of locks and I'm surprised how similar some of them are to traditional pin tumbler locks (so much so that you can use the same tools in some cases).

Human Error's Guide to Keeping Security Simple - Mimecast Security Awareness Training

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There appears to be an entire series of videos with this Human Error character. I like that, even though this is meant to be professional security awareness training material, they still have fun with it and employ humour to keep the audience's attention. I am a big fan of using humour to communicate security concepts.

Technician, pwn thyself

from here

They keep telling defenders that they need to think like attackers, but apparently some attackers need to think more like defenders.