[Pseudoscience-is-malarkey (OP)]

Here's a few:

1. 9.11 was perpetrated by Daffy Duck.
2. 9.11 was perpetrated by both the US and UK governments as a pretext to go into the Afghanistan mountains and mine kryptonite and sell it to extraterrestrial civilizations that want protection from surviving Kryptonians.
3. The UK originally intended to put the blame for 7.7 on England's West Country as a pretext to get rid of all the national embarrassments there. Nigel Farage proposed blaming it on the Romanians because he hates them so much.

[Zer0]

The conspiracy theory which states, all " Conspiracy Theories " are False.

[paul cotter]

Not so sure any of these are funny as they mislead an alarming number of gullible people down cul de sacs. Of the daftest, one comes to mind, ie David Icke's shape shifting lizard people together with the hollow moon controlling our thoughts to prevent enlightenment.