What does an upside down stamp mean?

My guy friend puts the stamps on his letters to me upside down. No, I'm not crazy. He said once at the bottom of the letter that, "the stamp would be upside down, but it was already on the envelope when I got it." So it has to mean something. I have heard that it means I love you. Does anyone know?... show more My guy friend puts the stamps on his letters to me upside down. No, I'm not crazy. He said once at the bottom of the letter that, "the stamp would be upside down, but it was already on the envelope when I got it." So it has to mean something. I have heard that it means I love you. Does anyone know? Thanks!
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