Elevators, it's always elevators.

Warm interior,
shiny silver doors spread wide:
elevator waits.

But when I enter,
floor chosen, you do not move?
You are slow! Go up!!

There's some little glitch in the elevator algorithm at work so that if the elevator is waiting for you on the bottom floor, doors open (aka, you don't have to push the button to call it) the doors won't automagically close when you choose a floor. Of course the "close" button does nothing either... you pretty much just have to wait until someone on a higher floor calls it.