A Little Priest and Bosom Buddies immediately came to mind.
I would also add The Grass is Always Greener, Class, second the previous mention from Gentleman’s Guide (in fact half the score) is funny. From The Producers, I would propose The King of Old Broadway, Betrayed (to me, the comedic Rose’s Song), and Keep it Gay.
Others would include Little Girls, Gooch’s Song, Broadway Baby. Comedy Tonight sets up Forum, but the song itself isn’t very funny. Everybody Oughta Have a Maid is a funnier song.
I feel like Mme. Thenardier always gets a laughwith her line in "Master of the House", where she notes her husband "thinks he's quite a lover, but there's not much there..."
I grew up listening to the 10th anniversary concert of Les Mis so I'm especially partial to her delivery of the line in that version
Love Sick from Women on the Verge of a Nervous Breakdown is my favorite of his. I'm always astounded by the rhyme he does between "needle, it'll" and "bleed a little".
Cole Porter's "Miss Otis Regrets". First performed in a revue, Hi Diddle Diddle, at London's Savoy Theater in 1934. And here, for fun, sung in French by Edith Piaf.