A thank you to Melkite from the Fisheaters Forum for this great story:
In high school, I had a friend who was the daughter of a Lutheran deacon, and a moderately anti-Catholic one at that. My friend was unable to find something, having searched her entire room looking for it. I told her about the St. Anthony prayer, she said it was hogwash, and then I dared her to try it. So she did, and sure enough, not 5 minutes later she found what she had been looking for in a drawer she had ransacked several times already looking for this item.