order by personal rank:

Sandstorm JP-8000 sawtooth DSP reversing https://www.youtube.com/watch?v=XM_q5T7wTpQ

Washing machines hacking https://www.youtube.com/watch?v=Q1S-PVo3GlA

AMD (ps5 sorta) security: https://www.youtube.com/watch?v=cVJZYT8kYsI

cool demo for the BT headphones talk: https://www.youtube.com/watch?v=TK5Tz4Bt94Y

precise time syncing with PTP: https://www.youtube.com/watch?v=dOt-zRIG5co

x86 > arm with intermediate: https://www.youtube.com/watch?v=3yDXyW1WERg