I worked in MRI for many years. There’s a big, red button behind a plexiglass access window that releases all the liquid helium which keeps the superconductivity of the big-ass magnetic coil. It’s called a quench, it’s loud, dangerous, and only to be used in life-or-death emergencies, e.g. person is trapped between an oxygen tank and the MRI. Pressing the button kills the MRI and it can cost millions of dollars to reactivate it.

I worked with these things for almost 10 years. The urge never abates, we just learn to manage it.