From The Inquirer (via Gizmodo):
A woman wrote to the Apple Forum to ask, "I took my husband's i-phone and found a raunchy picture of him attached to an e-mail to a woman in his sent e-mail file (a Yahoo account). When I approached him about this (I think that he is cheating on me) he admitted that he took the picture but says that he never sent it to anyone. He claims that he went to the Genius Bar at the local Apple store and they told him that it is an i-phone glitch: that photos sometimes automatically attach themselves to an e-mail address and appear in the sent folder, even though no e-mail was ever sent. Has anyone ever heard of this happening?"
This is, of course, followed by a long string of people saying "This does not happen," "I've never heard of such a thing," "He's lying," "Dump him," things like that.