Go on.
I'll start the ball rolling.
Taking one for the team and all that.
I personally like the ISIS and Al Qaeda conspiracy. That these very groups were created by western intelligence agencies to further foreign policy. The reason I like this conspiracy so much is because, if you believe Hilary Clinton and Obama, it's actually true!
Proofs:
Hilary Clinton admitting they created and funded Al Qaeda.
Obama saying he is speeding up training of ISIL/ISIS forces
Follow the Money! Plausible Deniability
Don't be shy! Favourite Conspiracy guys and girls?