enough to give you brain strain 
(ROOT (ADVP (RB enough) (S (VP (TO to) (VP (VB give) (NP (PRP you)) (NP (NN brain) (NN strain)))))))
(ROOT (ADVP (RB ) (S (VP (TO ) (VP (VB ) (NP (PRP )) (NP (NN ) (NN )))))))