One thing that many Java developers that I work with think is weird is that I speak in first-person for my objects. For example:
"I should calculate the total when given a new line item"
"...that is not my responsibility..."
I act like I am the object. It's so natural to me that I don't even think about it. Now, this is very common when designing with other Smalltalkers as well. Are we the only ones that do this? And if so why? Is it because we are behavior-ists (ala Wirfs-Brock) and not data-ists? I don't know, but I think it's funny and it's what makes being a Smalltalker a joy.