To become completely irrational; to react in an irrationally extreme manner.
lose one's wits
To become irrational; lose one's mind or sense of reason.
go ballistic
To become very angry and irrational.
with a vengeance
With an intense motivation; in an extreme, intense, or violent manner.
tear one's hair out
To react with extreme agitation.
put on airs
To become haughty, to assume a pretentious manner.
sink in
To become completely known, felt, or understood.