Chopping Onions The Dog

Listen here, lil' buddy. You are not the brightest bulb in the shed, are you? The joke plays on the double meaning of "onions." First, it's the vegetable that makes you cry when you chop it. But then, BAM! It turns out "Onions" is the name of the family dog. So, the person isn't crying because of the vegetable, but because their dog is gone. Get it now?