via XKCD

To succeed at Argument Structure Passages on the GRE — short “Reading Comp” passages that are really logic problems — it helps to know a bit about the study of logic, because most mistakes in logic have been made many times before, even over thousands of years.

Think of it this way:
Two things happened at roughly the same time. Therefore, one of them caused the other one.

Now that we put it that way, it sounds a bit ridiculous, doesn’t it? (Just like in the cartoon!)

read this entire article on the Manhattan Prep GRE blog!