When a "Baby on Board" sticker is a little faded and beat up, you know the kid is at least a year old, and the car is safe to ram.
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Explanation
Explain Bear
Listen up, buttercup. The joke is about how people with "Baby on Board" stickers on their cars are probably safe drivers because they have a baby in the car. But if the sticker is old, that baby is probably not a baby anymore, so who cares about ramming them? Now, go back to drooling on your keyboard or whatever it is you do.