Find a secluded wooded area. Make a “path” of charcoals and light it up. Let it ash over good and long, until it’s mostly ash, but there are still glowing embers remaining.
Do this at night, and “blindfold” your new members, but let them see enough just to see the glowing embers.
Before you make them walk the path, put ice on the bed of coals.
One, they won’t burn their feet anyway, b/c if you let it ash enough, there will be no burn threat, but TWO AND MORE IMPORTANTLY, b/c their senses are limited, they will feel the freezing ice and think their feet are burning.
I went through it, I found out what it was, I laughed and appreciated it, and was proud to prove that my care for the group was strong enough to empower me to be willing to walk on burning coals… even though i didn’t have to.