From the Irish Times,

The Government narrowly won a Dail vote against holding an immediate by-election in Donegal South-West this evening after two Fianna Fáil TDs voted with the Opposition.

Deputies Frank Fahey and Timmy Dooley “pushed the button the wrong way” in an electronic vote, according to Government chief whip John Curran. The vote was drawn at 76-76 and the casting vote of the Ceann Comhairle was required by Government.

Reminds me of this clip from Monsters versus Aliens:

I’m so glad we don’t have a nuclear arsenal at our disposal.