"Thanks to that constant motion on the seas, the beer fermented more efficiently—meaning more of the sugars turned into alcohol—resulting in a stronger brew. "
Total crap. IPA ferments in about a weak and stirring it will do nothing. It was stronger because stronger beer survives those conditions better.

Wait, are there even pipes in that Flogging Molly song??

Randel, no one drinks out of steins in Ireland.