First recorded by Inez & Charlie Foxx (US #7/R&B #2 1963).
Other hit version by Carly Simon & James Taylor (US #5/UK #34 1974).
From the wiki: “The original single was credited to Inez Foxx with vocal accompaniment by her brother Charlie, as they alternated the lyric on a syllabic basis. Considered something of a novelty song, it was a great success for them upon its release by Sue Records, reaching #2 on the U.S. R&B chart and #7 on the Billboard Hot 100 in late 1963.