What's the Craic? The Crack of Doom!

The Irish and Hiberno-English word and the English word are both cognates of German Krach, both come from a Middle English word "crak" which means noise or hubbub ...

In other words, the words are cognates of German Krach.

Was soll der Krach? and What's the craic? are basically the same question : "what's all the noise about" ...

And in case you thought doomsday was going to be a silent and intimate event, think again.

For the Lord himself shall come down from heaven with commandment, and with the voice of an archangel, and with the trumpet of God: and the dead who are in Christ, shall rise first.
[1 Thessalonians 4:15]

Trumpet's don't sound like piccolo flutes, they sound, well, brassy.

I suppose an Irishman will wake up and ask "what's the craic?" and a German will ask "was soll der Krach?" ... on the Crack of Doom./HGL