A bloke walks into a bar

And there are two Nuns playing darts. He offers to do the scoring. The first Nun hits a treble twenty with her first and second darts and double twenty with her third. The man shouts out “One hundred and sixty.” The second Nun goes to throw and hits a treble twenty, a single twenty and the third dart hits the wire and rebounds straight into the Nuns eye, killing her instantly! The bloke shouts out One Nun dead and eighty.”