Gyroids. I hate TTing to rainy days and having to put up with digging up the dozens of them because they're everywhere. >_<
Let's see... I would say maybe 50% of the default outfits in this game look terrible. Thank goodness they allow us to make our own outfits/share one another outfit designs.
Interestingly enough, there is a theory claiming Gyroids to be of a human origin. In the original Animal Crossing, players would wake up to find their faces strongly resembling a Gyroid if they had not been on the game for a long time. The only reason I'm bringing this up, is because you may have just insulted your own species.