When I first started graduate school, I was sometimes scared to talk to my advisor. It wasn't anything in particular about him, it was the role he was in. In pretty much every job I've ever had I've always felt a little weird around my "boss". It's just not someone I tend to feel chummy around. Maybe it's just how I was raised, I don't know.
But toward the middle / end of my PhD, our relationship shifted to being more peer -like instead of student/teacher -like, and I felt much more comfortable with him.
It's been very interesting shifting to the other side of the desk. I met with a graduate student recently, and during our meeting I noticed their hands were shaking. I tried everything I could to put them at ease, but no matter what I tried they still seemed terrified.
Now, it's true I'm mean and uber-scary looking (like Miss Viola Swamp), but I wonder if there's anything I can do to make students feel less scared when they come visit. Maybe I need a gigantic stuffed animal in my office. ("Hug me if you're scared!").
Heck, some days I need one of those...