My dad used to sing this, much as others have quoted. But when he sang it, he paused briefly after "when a gentleman dapper stepped out of the" before continuing with "phone booth" (reminiscent of Benny Bell's "Shaving Cream" or some of the "Miss Lucy" rhymes that kids sing.)

Funny thing was that when my daughter and I visited him in the nursing home (he has dementia) last week, we sang it with him, and when I paused after "came out of the" he sang "crapper". Oh well...