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