I guess you didn't see the video of a Redskins fan burning a Terrible Towel just before the season opener, eh?
Then there's the Tennessee player who stepped on the towel, during the Titans' best season ever. They promptly lost their first playoff game, and never went back. They've pretty much sucked canal water ever since.
Desecrate the towel at your peril...and be warned...St. Myron's wrath can be a terrible thing.