Each Of Us Is Wearing An Unlicensed Nuclear Accelerator On His Back
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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.