Digit-al Calculator

(My dad lost his pinkie finger to an electrical saw. One day, swimming with the grandkids, one of them comes running to him.)

Grandchild: “Granddad, please show your pinkie?”

(Granddad, knowing which one he means, obliges. The grandchild turns to his friends who had followed him.)

Grandchild: “See! I told you my granddad cannot count to ten anymore!”