A state representative accidentally pushed the wrong button and cast the deciding vote to legalize fracking in North Carolina. According to the Atlantic Wire:
The House needed exactly 72 votes to override the veto late on Monday night and Democrat Becky Carney (who voted against the original bill) was lobbying fellow Democrats to vote no. But when the time came to cast her vote, Carney hit the wrong button. Her "yes" vote gave opponents exactly 72 votes. Oops.
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Just after the vote, Carney's voice could be heard on her microphone, saying "Oh my gosh. I pushed green."
Even more bizarrely, House rules prohibit changing your vote if doing so would affect the outcome. …
Carney apologized profusely and blamed the error on late-night fatigue, saying, "I feel rotten, and I feel tired."