The Power Ponies Funko Mystery Mini figures are out there in the wild now, and specific retail locations have different exclusives as part of the set. Walgreens is one of those, with a Rainbow Dash, Spike with a cape, and... The head of Mane-iac. Yes, that is apparently what comes with it. Even the box art shows that this is not an error. In a set with a bunch of completed ponies, you get the seemingly decapitated (or constipated) head of the villain.
Regardless, the other two are normal! Go get them below.
Found in Puerto Rico
Thanks to Victor and Cindy for the heads up!