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A wake up test?

The Anaesthetic Department in our hospital has recently purchased comfortable seats with armrests and backrests. While reclining on this seat in the narrow space available to us next to the anaesthetic machine, the backrest pressed against the air pressure reducing valve on the wall-mounted gas supply (East Health Care; 7–4 bar medical air reducing device – Fig. 1). This released the Schrader valve, leading to the air tubing becoming detached and shooting forward accompanied by a loud noise. We took turns reproducing this effect until told to stop by the surgeons.