[El Sordo]

“That's not Smith's passport stamp. woofie, another Freeper, posted that as an encouragement to Smith to show his. If you look carefully, you can see that the dates don't match Smith's story.”

Too late. It has been alluded to as being Smith's passport stamp.

So it is now Established Fact that Smith provided proof of his trip.

[rodguy911]

Has Smith ever taken a polygraph?

[LorenC]

Too late. It has been alluded to as being Smith's passport stamp.

So it is now Established Fact that Smith provided proof of his trip.

Just like the legend of Maya's COLB. Or the completely fabricated rumors of a half-brother and half-sister who claimed he was born in Kenya. Or the April Fool's application for foreign student aid.

My personal favorite is still "Obama said he wants to change the National Anthem to 'I'd Like to Teach the World to Sing'." That story originated in a satire column (by a columnist who posts here at FR sometimes), as a joke. But later on, you not only had people claiming that it was real, you can find people who swear they saw him say it on TV. They have created memories of a non-existent event, and no amount of source evidence will persuade them that they're wrong.