Other conspiracy theories DU has crapped out over the years that I can think of just off the top of my head:
1. All their countless threads dealing with chemtrails.
2. On one occasion when Randi Rhodes appeared covered in bruises, the DUmmies claimed that it MUST have been mean old conservatives attacking her to try and silence her! Then, of course, it came out that she just fell over while drunk.
3. Schools only have PDA bans as part of the Right's diabolical plot to persecute gays.
4. A (Thankfully) unsuccessful attempted arson attack at Sarah Palin's church when there were women and children present was orchestrated by Palin.
5. Chipotle a few years ago experiencing a serious e. Coli outbreak and being exposed as having multiple serious health code violations at many of their locations was all part of an evil plot by "Big Food" to discredit a chain that successfully sold health food.
6. Al Franken being exposed as having sexually harassed women was all a big conspiracy by the Right to slander and discredit him, even after Franken personally confessed to it.
7. Illegal immigrant kids being put in detention facilities is part of an insidious plot by "Fundies" to force the children to convert to Christianity, with the supposed "Proof" of this being that some of those kids are taken from the facilities and put in faith- based foster homes.
8. Trump is in bed with the Mafia.
9. Of course, all the innumerable times that the DUmmies have claimed that all the violent extremists on their side (Especially at Occupy/ Antifa riots) MUST really be "Agent provocateur" plants by the cops to make the leftists' movements look bad.
If I can think of any more, I'll list them.