The Seafarer (Booth, 222 W. 45). What’s the Broadway show to see if you’re only seeing one? I strongly recommend Conor McPherson’s uncommonly powerful fantasy about an unhappy Irishman (David Morse) who swears off the booze and finds himself standing face to face with the Divvil Himself. “The stuff of greatness,” say the posters. “Do not miss this play!” Yes, that’s what I wrote in The Wall Street Journal, except for the gratuitous exclamation point, and I meant every word (TT).