derationalize
irrationalize
go batshit
pop one's cork
flip one's wig
have a screw loose
lose one's wits
take leave of one's senses
go potty
loco
becraze
lose one's mind
drive someone crazy
go mad
spaz
outstupid
lunatize
derp
mope
think no end of oneself
outjig
dumb
distract
unreason
scare someone out of their wits
go ballistic
go crazy
rationalise
craze
rationalize
phony
unnaturalize
duncify
idiot-proof
not have both oars in the water
hyperexaggerate
ineffectualize
overmanipulate
mislead
crazen
play silly buggers
fool
ham
blockhead
take the piss
faken
booby
stupidify