Cavemen dealt with stupid caveman using the following:


As Man became smarter in the middle ages, he started using the following:


Even children wanted a means to deal with stupid people, so they came up with the following:


However, if you are looking for a less violent approach, you can always try out the following:

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If your nose runs and your feet smell, you could be upside down! O_o
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There was a man who entered a local paper's pun contest. He sent in
ten different puns, in the hope that at least one of the puns would win.
Unfortunately, no pun in ten did.