Friendly slightly prolonged eye contact from (certain?) strangers/acquaintances is one of life's best little pleasures imo. A little jerk out of interpersonal separation, a little energy jolt. It's interesting how something as minor as making your eyes shine can have an observable effect on the other person and I've played with this just to see what happens but I feel kinda manipulative and weird about it (I'm not as genuinely friendly as wacey).

As for everyday usual, when speaking with people I don't try to catch their eye. I'm probably looking between or around their eyes a lot of the time. If they catch my eye I notice and look back at theirs.