They say the joke – in truth, unless you’re a religious Jew I don’t think you get it – that an antisemite told a Jew, say your last prayer because I am going to kill you; so he made the blessings Boruch… Al Kiddush Hashem; seeing the great fervency of his blessing the antisemite had a change of heart – nu.. nu.. nu… said the Jew to him. not wishing to make a Brochah livatalah (say a blessing which has God’s name in it for no reason)