The Mother Of All Demos is an absolute classic: https://youtu.be/yJDv-zdhzMY https://en.m.wikipedia.org/wiki/The_Mother_of_All_Demos

I also very much enjoy Feynman’s talks. Here’s one on imagining physics: https://youtu.be/4zZbX_9ru9U

For computer science in particular, I highly recommend the first lecture in the SICP series, especially on the naming of so called “computer science”: https://www.youtube.com/watch?v=2Op3QLzMgSY

Last Lecture by Randy Pausch

https://www.youtube.com/watch?v=ji5_MqicxSo

I know this is a parody, but it still seems pretty relevant: MadTV apple iRack Iraq war parody - https://m.youtube.com/watch?v=xcjLEwZqcQI

What fields(s) are u talking about, specifically?

This Warren Buffett speech is really great:

https://www.youtube.com/watch?v=2MHIcabnjrA