If the studio speakers were cranked, those duck farts would rattle the room. "..in the air, everywhere - the scent of ducks flatulating on EZ One Hundred"
My favorite was a preacher on XERF in the 60's. He had a cart with 25 Hz tone on it, and, during is donation pitch, he would hit the "play" button while saying, "put your hands on the radio and feel the power of the Lord".
Folks who felt their radio vibrate would be close to rapture and prone to sending in for the $5, $10 or $20 blessings the preacher offered. Who wouldn't after being touched by the Lord?
Sergio Ballesteros, a friend who was GM of XERF at the time, said he once asked the preacher what the difference between the $5 and the $20 blessing was. Answer: "Fifteen dollars".