I don't trust people with overly twee gardens (lots of plastic ornaments, regimented marigolds etc.) as I think they may be secretly serial killers.
Yes, indeed. Someone who lives near my PILs does this, and, to add to their misdemeanours decorates their entire front garden seasonally in an incredibly sinister fashion.
At Christmas there was a shop window mannequin wearing a Santa costume, surrounded by light-up reindeer of different sizes, some dragging various sizes of sleigh filled with Elf on the Shelf type elves and garden gnomes wearing Santa hats.
For Easter, the same shop window mannequin is wearing a fluffy onesie with a rabbit tail and fluffy ears on a hairband, and the garden gnomes and Elf on the Shelf elves are frolicking with baskets of eggs.
I swear, I speed up when we pass it in case the Easter Bunny/Santa Claus comes after me with outstretched arms and dead eyes. 
I've never laid eyes on the owners, but I realise that if I did, I would expect them to resemble Fred and Rose West.