SHRINK YOUR VERY OWN PINKIE INTO A WEIRD STUMPY THING
Your naked pinkie finger is displayed in all its natural pinkie-ness. You gently grasp the tender pinkie with the thumb and forefinger of your other hand...and visibly compress your little finger into an incredibly teeny tiny pinkie...so it's about half the size of the original!
Both sides of the weird tiny stumpy thing are shown. The pint-size pinkie even wiggles a bit. It actually is your real finger...just a whole lot smaller.
You then stretch your dwarfed digit back to its original pinkie size...where it can be poked and prodded by disturbed passers-by.