When I was growing up in the U.S., there was a persistent rumor that there was a Return of the Jedi Death Star playset on the way. There was always the one kid that claimed to have it, but he was always the kid that never had anyone over to witness it.
Sadly, this behavior (or delusion) carries over into adulthood for some. I was conducting a presentation on 1980s Toys at Emerald City Comic Con in Seattle, Washington last year when an audience member told this whopper about playing with Dinosaucers toys at a K-Mart store in the U.S. He claimed he opened them up in the aisle and played with them before his parents caught him and he got in trouble.
Thing is...Dinosaucers were never produced and the tooling ended up in South America where a few rare knockoffs were made. I told him that (while trying to be nice) but he wouldn't believe me. The encounter is on video on YouTube -- so at least you know I'm not making this up.