There's a ton of horror movies which show mannequins or more likely dolls which come alive and start pursuing people, killing them and such, so no wonder why there're people who find dolls and puppets a bit terrifying. Of course, everyone understands that such fears are silly and have no logical background behind them, but still the situation gives much inspiration to both horror movie makers and pranksters like these ones! Have fun watching poor strangers being welcomed by a mannequin when they were expecting it least of all!