Meeting Others with Eye Contact
When I was a kid, I was terminally shy. The concept of eye contact was as terrifying as jumping off a bridge. The sensation of the hair raising on my back each time I'd even glance someone's way was a clear sign of being in a flight response. If I didn't know you, I probably barely would look you in the eye.
Thankfully, partly through the miracle of puberty and then practice through college, I had far less trouble making eye contact with folks; came to understand the cultural norms regarding it as well, just so I didn't overshoot any tender boundaries.
What I've noticed over the years in networking and business meetings is almost an inverse problem that I had — people are too focused on eye contact. Not in a creepy way, but in an exclusitory way.