They probably only wanted to ask you a question. And you only have a vague memory of watching it happen. Worse, for all the different ways you can think to react, there are at least as many things out there that can cause you to react unpredictably. That won't happen to me. Til about a month ago, when I nearly geeked a very dear friend of mine in her sleep.
Dreams can cause reflexive actions, too.
Then I'll get a reflex trigger, you say. And it's not an add-on gizmo, either you get one when your wires go in or you don't. Ask your rigger bud, she'll understand, maybe even sympathize. It's in the blood, they say, but more likely, the brain. The trouble comes when your subconscious never bothers to gear back down to normal speeds.