Pediatric thoracoscopy with pt in lateral decubitus with DLEndobronchial tube--->and the anesthesia machine fails!

The cool CRNA bagged the pt, switched to a Jackson-Reese, and we started TIVA with Propofol (gave some Fentanyl & Versed too). Said he never saw this in 30 years...awake emergence and child did fine.

How rare an occurrence is this?