Star at the front

Little Johnny drives with his uncle in his new Mercedes. He asks him, “Uncle Bob, what is that star at the front for?”
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Uncle Bob chuckles patronizingly, “It helps me run over old people.” He prolongs the joke by swerving a hair’s width away from an old man on a bike and pretends to be angry he missed him.
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Little Johnny says, “You know, uncle Bob, I think your star isn’t working properly. If I didn’t open the door in the last second, we would have totally missed him.”