Shoelaces

I had these shoes, they fit very nicely, but after several weeks of wearing them something strange happened. My shoelaces were untied. I tied the laces thinking little of it but 3 weeks later they were untied again. I retied them thinking more suspiciously of it. Who would want to untie my shoes? The same thing happened 3 weeks later. There is only one logical answer, my shoes are cursed. So I incinerated my shoes and now wear velcro sneakers. I still have nightmares about those shoes...