Biggest boneheaded plays in sports you remember

[SabresRule]

In light of DeSean Jackson's Monday night screwup that some of us view differently (Bill considers it the dumbest play he's ever seen; I don't rank it as high because the Eagles scored on the very next play), what are the most boneheaded plays in sports you recall?

This is my nominee:

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[Paul Wozniak]

Jose Canseco bouncing that flyball off of his "bonehead" into the stands for a HR, ranks up with some of the worst.