Minneapolis garage rockers The Castaways performing their hit “Liar, Liar” in the 1967 “feminist” beach movie, It’s a Bikini World.. The song reached #12 in the charts in 1965.  Dig this guy’s falsetto! Plus you get a real boss go-go dancer. What’s not to love here?

“Liar, Liar” was covered by Debbie Harry in the 80s. The Castaways original was later used on the soundtrack to Lock, Stock and Two Smoking Barrels.
 

 
Thank you Douglas Hovey!