nutso
crazyitis
toys in the attic
wingnuttery
lunatically
cuckooness
screw loose
insaneness
mad
nutsiness
insane
batshit
Caligulism
sick-ass
mishegoss
high strangeness
vesania
flooey
crazy
bugnuts
psycho
agateophobia
maniacal
jimjam
bonkersdom
meshugaas
few cards shy of a full deck
Ophelian
insanity
gonzo
batshittery
through the looking-glass
mad as a cut snake
doolally
screwiness
insaniac
gloppen
dementia
half-cracked
cuckoo for Cocoa Puffs
set one's hair on fire
insanitarily
out of one's box
off one's tree
crazyhead
phrenesis
out of one's gourd
out of one's tree
bizarrity
off one's box