RichThesaurus
go bananas
vs
have bats in one's belfry
go bananas
verb
To become silly or excited; to go crazy.
To get angry; to go mad.
have bats in one's belfry
verb
To be crazy or eccentric.
How often have the words
go bananas
and
have bats in one's belfry
occurred in a corpus of books?
(source:
Google Ngram Viewer
)