A few. I actually thought about it when you first posted your list. I'm fairly used to someone poking around my head, and so long as it doesn't leave me horribly disfigured or acting in suspect ways, I don't particularly mind. It might be interesting. And if I can help my roommates out getting things in exchange, that's even better.

Plus, maybe if you had a volunteer, others might note that you aren't into this for nefarious purposes.