Why not. :)
(In no particular order)
1. Henry Lewis (I think it was him) running across the stage smack into the column holding up the second floor in the Play That Goes Wrong, and seeing the whole second story of the set take a dive. I simultaneously gasped and chortled.
2. Put on Your Sunday Clothes, from start to finish. Eargasm, eyegasm, everything.
3. The chromolume in SITPWG. I really don't care for that show (wanted to see it for the cast), but that moment was worth the price of admission. I have been secretly hoping they take it to an actual museum, because it deserves to be seen as a piece of art.
4. Struggling to pick a moment of DEH, because I am one of the people who cannot get enough of that show, but it's a toss-up between the powerful vocal arranging in You Will Be Found, and Rachel Bay Jones making me ugly-sob through So Big/So Small.
5. The Great Comet set & lighting. I still can't get into the score, but credit where credit is due. Exceptional.
Honorable mentions: the Miss Saigon helicopter (still thrilling), Rodney Hicks' character arc in Come From Away, the czarina's white gown & crown in Anastasia (literally took my breath away for a second), Bette's Act II eating scene