ha-ha button - The button on the elevator that looks important but is just

The button on the elevator that looks important but is just a prank, like the elevator’s way of saying, 'You’re not getting anywhere.'

I thought that button was real. Then I pressed it and the elevator just kept going. I was confused.

The ha-ha button is the elevator’s middle finger to everyone who uses it.

I pressed it because I was desperate. The elevator ignored me.