- Many of the death scenes, in true Black Comedy fashion.
- "I've Decided to Marry You," as Monty frantically attempts to prevent Sibella and Phoebe from discovering each other's presence in his apartment.
- "I Don't Understand the Poor" can be this for Lord Adalbert D'Ysquith depending on how it is played. For example, the audience at one performance of the original Broadway run cracked up when Jefferson Mays directed the song to those seated in the balcony (the cheapest seats in the theatre, i.e. the "poor" seats).
- Asquith D'Ysquith, Jr., and his showgirl paramour skating in the background during the first half of "Poison in My Pocket."
- Every second that Lord Adalbert D'Ysquith and his wife Lady Eugenia D'Ysquith share the stage.
- How Monty receives letters onstage
- When Miss Shingle shows a perplexed Monty how to open his mother's old jewelry box—by simply pressing a switch on the side. What really makes the moment is the "sproing" sound that plays when the lid opens.
- The "warning" to the audience at the beginning of the play
- Adalbert's pet/stuffed ferret.
- Reverend Lord Ezekiel D'Ysquith's manner of climbing the church tower, as well as the wind effects on his hair at the top of the tower.
- Every single one of the D'Ysquith deaths.
- What Monty does with the belladonna flower (see Brick Joke on the main page).
Funny / A Gentleman's Guide to Love and Murder