Nothing horribly weird. I was making a sign and used a pencil to lightly letter it, then went over then with Sharpie. I realized we didn't have any erasers, but that we did have rubber bands, so I wadded one up and tried it out. It worked remarkably well, and erased the pencil marks.
I did not know this was not more widely known. You can wrap the elastic around and around the top of the pencil in a sort of ball to make a pencil-topper eraser, too. I inherited a few such at my previous job.
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