Wait, I thought it was 6?
They sure do double down on the conspiracies pretty quickly
My personal favorite is the NWO+aliens combination, where NWO is a sort of collaborative, marionette institution. Your imagination has pretty much no limitations, and the humongous projects and facilities that are conjured alongside dwarf any singular effort of humanity by orders of magnitude. It's the 'go big or go home' of conspiracies, and a central node that binds together very very kooky stuff, like hollow Earth, psychic alien contact through channellings, parasitic energy drain to other dimensions etc.
I am amused when people believe that whatever conspiracies there are have large groups of people 'in on it', with thousands and thousands of people consciously involved in malicious plots and deception, and no one spilling the beans, it's just so ridiculous technicality-wise.
That's why it's called conspiracy, after all.
I would concur with many claims by many conspiracy theories and be able to admit that indeed, such a process is going on, but mass intentional involvement is what's often my issue with them. That's not how things happen, it is a very central-planing-ish way of looking at things.
Any covert government action theories is just speculation on hidden activities of the state, and it lacks the kookiness and outlandishness of the deep stuff. It deserves a place in normal discourse.
It's also fun when the theories tie with faux metaphysics and psychedelics, because it tends to produce pure, undiluted blabber.
One of the absolutely least favorites would be the depopulation, due to the anti-vaccination movement, and other anti-medical phobias that it has spawned.