The unwritten rules of riding the elevator

[GonzoStyle]

I mean in reality you are wasting time because the elevator now has to make an extra stop to come back to where you are, instead of you having got on and then made the trip straight.

not if you already pressed the "down" button. it's not like the elevator knows you got on it.

but if you get on then the trip back down will be straight down cause the elevator already stopped, by not getting on you're making the same wait either way while it goes up but it's an extra stop to re-pick you up again. It has to stop on the floor you are on again.