The TLA+ Lectures are awesome:
https://www.youtube.com/watch?v=p54W-XOIEF8
[suddenly in a clown costume] "What kind of clown am I, claiming I can make you think better? Why should you pay attention to me?"
[in a suit] "This is not the time to be modest. I have done seminal research in the theory of concurrent and distributed systems for which I won the Turing award. You can stop the video now and look me up on the web." [long pause]