I tasted Sichuan Chinese food today for the first time and I experienced strange vibrating sensations in my lips.
They lasted about a minute or so and were very prominent.

Turns out many people experience the same sensation and they agree on 50 Hz as their frequency:
https://www.npr.org/sections/thesalt/2014/04/17/290896594/sichuan-peppers-buzz-may-reveal-secrets-of-the-nervous-system

I wonder if this sensation relates to vibrations Daniel writes about in his book. If yes, how?