Grandpa had what you call nowadays, a "hidden talent".
Grandpa had learned to whistle while in basic as part of his training for being in the Signal Corp in preparation for Guadalcanal. The whistle that he specialized in, a vibrato which changed registers, was used when his company was using communication radio.
You see, when he pitched the vibrato, it created an interference that enemy signals could not descramble and that made any communication top secret and free from any eavesdropping.
Anyways, after the war, he was invited to perform on a local radio station, KFBR, because Roger the Broadcaster, a graduate of Notre Dame, was also a war veteran who lost his right forearm in Normandy. Not by gunfire or anything like that, he was trying to find an edible chocolate cake in a bombed out bakery and crushed his arm in one of those walk in freezers. They couldn`t get him loose so they decided to just lop off his arm. He didn`t mind all too much because this meant he could go home and resume the radio business.
So Grandpa performed on KFBR, which was sponsored by Pall Mall cigarettes, and afterwards Roger asked Grandpa where did he learn to whistle like that. Grandpa told him that the only place to learn was in the shower because the acoustics produced perfect pitch and harmony, two things that were important to whistling. Roger pointed to a white door at the back of the studio and said there was a shower.
Three months later, Roger won the Eastern Regional Whistling Championships, sponsored by Pall Mall Cigarettes, and sent Grandpa a coupon for the Brown Derby, compliments of KFBR.