In an experimental setting, I was once given a screwdriver to feel the field around an MRI machine. They asked me to be very careful of course, because loosing the grip would indded have ment the machine would need to be shut down...
I have a meteorite wedding band and we were passing it around outside the bore to feel how strong the pull was. A grad student lost their grip and the ring shot into the bore like a bullet. No damage luckily but it really drove home how dangerous these can be.
