Everybody has a topic they can bore people to death talking about...

LARPing
History and Religions (I can go on and on about Pope Alexander VI and the Borgia family)
D&D
Video games

Piezo electric quartz crystal devices

Aren’t those how most wristwatches work?

Yes although that is changing; I understand that some watches are using a capacitive timing circuit but that has developed after I left the industry.