go mad
loco
lose one's mind
drive someone crazy
go potty
insanity
hystericize
madden
insaniac
psycho
bughouse
crackers
hatstand
not have both oars in the water
nutso
off one's chump
off one's head
out of one's mind
derange
maniacal
get one's freak on
off one's onion
off one's rocker
gone fishing
nutzoid
off the beam
nut out
lunatical
crack up
deranged
off the rails
insano
potty
spaz
go ham
loony
insanitarily
mooner
gelt
maddening
lunatize
not wise
gobaloon
meshuggener
loony tunes
insane in the membrane
stark raving mad
not right in the head
jimjam
stark staring mad