First Week as Handyman Apprentice: Blew the Manifold Gauge and Nearly Caused a Flood

Man, first week on the job as a handyman apprentice and I already screwed up big time. Boss had me helping with a basic pressure test on some new PEX lines in an old bathroom reno, and I musta bumped the manifold wrong 'cause it spiked to like 500 psi outta nowhere. Water started spraying everywhere before we shut it off, soaked the subfloor and everything. We're in rural Ohio, so these old houses got no give, and now the client's pissed about the delay. Boss chewed me out but said it's a lesson - always double-check the valves before cranking it up. Feel like an idiot, but damn, handyman work ain't as simple as it looks from the outside. Gonna be more careful next time.