I feel I'm usually pretty decent at anticipating how new peoples' voices will sound before I actually hear them speak. It's always quite entertaining to me when I do hear them and I was totally off. There's a person who I hadn't heard speak until recently whose voice was at least two octaves lower than I was expecting, and I couldn't help but smile a little the first time I heard him say anything. There are also two guys on the Project team who are massive behemoths, I'm guessing at least 6'10" tall, and both of them have super-high-pitched voices. One of them in particular sounds like he's 11 years old.