Funnily enough, 1 of the most underdocumented feats in Mario is the Metal Mushroom.
Specifically, the version that appears in Mario Party 5 (I think?), 6 & 7.
Besides making the user metal, it makes them immune to traps, shown as the character literally fighting away the trap's attacks.
Knocking away Amps (Which use Electricity.), Podoboos (Fireballs.), falling Spiny Shells, headbutting a falling Thwomp to send it flying, etc.
It's a neat display of skill, maybe meant to homage the Metal Cap from SM64 that grants invincibility.
IT'S JUST A SHAME THAT NOBODY DOCUMENTS IT.
To see those animations, you need to use to roll well enough to pass an opponent's placed Roadblack Trap (Red Orbs only; Yellow don't matter, & Green & Blue Orbs usually don't affect spaces.) on the same turn that you use it.
& since its only functional effect is immunity to Traps that usually only take away a few coins.... Well, it doesn't see use very often. : (
It's a shame, since it's probably a nice amp (Aligns with how Metal Bowser is at least heavier in MP2.) for Boo & Koopa Kid at least (Playable in the GC MP trio.), as well as Dry Bones from MP7. Since again, normally a Thwomp can crush a character flying, but Metal Form characters utterly overwhelm it.
I wonder if the fodder get anything similar via coins.