The best-known, most notorious version was a hit in 1963 for the Kingsmen; the FBI spent two years investigating the lyrics before declaring they not only were not obscene but also were "unintelligible at any speed."
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Taxpayer dollars were spent for the FBI to investigate the lyrics to the song? Geez...they could have saved the money...any one of us could have told them it was unintelligible. LOL
To hear the obscene lyrics you have to play it backwards (or sideways, I forget which)