the four feathers is definitely horse feathers 
(ROOT (S (NP (DT the) (CD four) (NNS feathers)) (VP (VBZ is) (ADVP (RB definitely)) (NP (NN horse) (NNS feathers)))))
(ROOT (S (NP (DT ) (CD ) (NNS )) (VP (VBZ ) (ADVP (RB )) (NP (NN ) (NNS )))))