This one may have been in 1959 when Paul Evans got to number 25 in the UK singles charts with Seven Little Girls Sitting in the Back Seat.
As I recall, the number was a late addition to the show and was a tab scene, one of those performed in front of the curtain while the scenery was changed behind.
The car was made up of pairs of chairs with a cardboard ‘car’ fuselage facing the audience.
Me and six other eight year old boys were made to play the ‘girls’ for laughs, make-up, wigs the lot, miming to the record.
Such was our embarrassment and disgust, and so sullen was our performance, that the song was dropped after the first night.
Here is a more enthusiastic rendition by Paul Evans with a rather glaring error if you can spot it.