Yet A is happy!
Oh, so happy!
Laughing, Ha! ha!
Chaffing, Ha! ha!
Nectar quaffing, Ha! ha! ha!
Ever joyous, ever gay
Happy, undeserving A!
If I were Fortune which I'm not
B should enjoy A's happy lot
And A should die in miserie
That is, assuming I am KEITH
(With apologies to WS Gilbert)