Four years ago, "The Simpsons" put together a short clip in which Homer wanted to vote in the presidential election. He stands in front of the electronic voting machine, pushes the button for Barack Obama, and the machine immediately registers a vote for John McCain. Homer keeps pushing the screen for Obama, and the machine keeps lighting up for McCain.
When this happens in real life, it's a lot less funny.
NBC News has confirmed that a Pennsylvania voter recorded this video today, using a voting machine's touch screen to vote for Obama/Biden, though the machine automatically interprets this as a vote for Romney/Ryan. Just like Homer Simpson, this Pennsylvania voter keeps saying he wants to support Obama, and the machine keeps saying otherwise.
The machine in question was reportedly taken out of service once the voter brought it to the attention of elections officials.
Update: Mother Jones reports that the machine in question has been "recalibrated" and is now back in use.