I do this whenever I'm in an area breathing "canned air". Stores, modern office buildings, etc. The more people are in the building, the worse it is. And in my case, I am sure at least some of it is an issue with air; I don't know why, but it's like a meta-sensory issue - if my body doesn't think I'm drawing in enough air, it seems to want to flick on autopilot or something...
(As I type this, I have viral bronchitis. That is fun, to say the least...)
_________________
AQ Test = 44 Aspie Quiz = 169 Aspie 33 NT EQ / SQ-R = Extreme Systematising
===================
Not all those who wander are lost.
===================
In the country of the blind, the one eyed man - would be diagnosed with a psychological disorder