I grow weary of people constantly shouting 'Placebo effect! Placebo effect!' incorrectly.
Placebo Effect: A placebo effect actually changes outcomes - it DOES make a difference.
peeve: facing north is just a placebo effect - No! If it did not change the outcome it was not a placebo effect.
Lookup sharpshooter fallacy - that's more geared towards a correct usage.
I faced north and got an HQ! It's because I faced north I say! - Not strictly sharpshooter but a lot better than placebo effect.