Dr Ray Stantz: You know, it just occurred to me that we really haven't had a successful test of this equipment.
Dr. Egon Spengler: I blame myself.
Dr. Peter Venkman: So do I.
Dr Ray Stantz: Well, no sense in worrying about it now.
Dr. Peter Venkman: Why worry? Each of us is carrying an unlicensed nuclear accelerator on his back.
The guys ride the hotel elevator to the twelfth floor to face whatever disturbance awaits them.