What does “hit me like a two-by-four” mean?

What does this sentence mean?

This observation hit me like a two-by-four




2×6, fka 2×4

Image courtesy of Wikipedia.

Edit: Wikipedia has since corrected itself that this is indeed a 2×6, but you get the idea.

Oh, and the sentence as a whole means that the observation was a big surprise or a great shock; an aha experience or a eureka moment; an eye-opener.

Source : Link , Question Author : instantsetsuna , Answer Author : RegDwigнt

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