Idiot: "Yay! I got a B+ on my math test!"
Normal Person: "How? You said 2 + 2 = 22..."
Idiot: "So? It says it's right..."
Normal person: *facepalms* "Teachers adding to the stupidification of their students."
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McDonalds' Hot Coffee's "Caution: Hot" label, after someone spilt their
hot coffee on their lap and successfully sued because their hot coffee had no warning that it was hot.