If you make a mistake in the voting booth, chances are good that no one will ever know, unless you say so. Members of the House of Representatives not only make voting errors, but they also own up to them in public to avoid the political fallout for taking an unpopular position.

To vote in the House of Representatives, lawmakers are given a personalized plastic card that is dipped into an electronic voting machine (a device, incidentally, invented by Thomas Edison, though his was never used by Congress). The lawmaker then presses one of three buttons marked “yea,” “nay” or “present,” and the vote is recorded.

Most of the time, that’s the end of the story. But members of Congress are just like us: They make mistakes. Members of the House have voted the wrong way at least 112 times since the beginning of 2011 (see all of them here). This isn’t an epidemic; the number of mistaken votes represents about one in every 10,000 individual votes taken during that span, and no member of the House has done it more than four times (Adam Smith, a Washington Democrat, holds the dubious honor).