I was pretty annoyed recently at how people can’t make simple logical arguments. Granted, this was on the Internet, so I didn’t have high expectations. I made a diagram about the five most common logical fallacies I see in forums, explaining what they are.
Couldn’t get the image into a high resolution version despite numerous attempts, so sorry for the low quality. Or maybe it’s just the Arial font that doesn’t size well. The SMBC comic in the middle looks pretty good.
A Reasoner's Miscellany 