Eric, without even thinking about it, goes around whistling hymns. One Sunday as he was whistling a hymn throughout the church, filling the building with the joyful sound, a few people came up to him and firmly said, "You can't do that!" or "That is rude!"
It took us a minute to figure out that they were talking about him whistling! To them, whistling is rude - ESPECIALLY inside a building.
We were told this comes from the superstition that, if you whistle you will lose your money...so it is even more rude to whistle at someone else's house. ;)
Even if Eric tried, he can't refrain from whistling. Everyone still says something, but they all just laugh and understand...
Americans are Strange!