I do this sort of thing at busy stop-signed intersections. See, many people in my area have a tendency to be nice and wave you through, even when they have the right of way - it's infuriating! They're just slowing us both down by not being assertive and predictable. So I've taken up the habit of adjusting my speed approaching the intersection to avoid stopping at the same time as someone else. Usually that means slowing down a little bit early, then just creeping for a couple seconds but not quite coming to a stop until I see them start to accelerate away. Less often I'll do the opposite though, if it looks like I'll get to the intersection slightly sooner than another person, or I know that I should have the right of way, I'll be more aggressive and try to stop and accelerate away (safely) before they would even need to wait on me.