In the US, it's kind of a tradition to eat stuff called "corned beef" and cabbage on St Patrick's day.
To me, corned beef is, like, the beef equivalent of spam. It comes in tins. Nobody eats it.  Ever. Certainly not on Paddy's day.
I imagine corned beef in the US is much more palatable. Must try it sometime.
(Cabbage, on the other hand, is common in Ireland. My favourite is savoy cabbage chopped up small and sweated in butter with bacon for multiple hours and lots of pepper. Mmmmm.)
A little difference, to be sure.
 Obviously *somebody* must, otherwise you wouldn't be able to buy it in e.g. Tescos.