Frank says:

This is Frank Zappa saying, Don't do speed. Speed turns you into your parents. -- this used to play OFTEN as a public service announcement(PSA) on radio station WHFS at 102.5 FM in bethesda,MD.USA during the early '70's. it was followed by a nearly inaudible whisper, "...but grass and acid are o.k.", which may have been frank, or one of the mothers.