have bats in one's belfry

Etymology
1899, from tendency of bats to fly around erratically, with “belfry” indicating “head, mind”.

Verb

 * 1)  To be crazy or eccentric.
 * Anyone declaring himself Emperor of San Francisco probably had bats in his belfry.

Synonyms

 * See also Thesaurus:insane

Translations

 * Danish: have rotter på loftet
 * Esperanto: havi muŝon en la cerbo
 * Finnish: olla sekaisin, olla latvasta laho, olla häkää yliskamarissa
 * French:
 * German:
 * Hungarian: nincs ki a négy kereke
 * Italian: mancare di qualche rotella, essere svitato
 * Polish:
 * Russian: винтика в голове не хватает,, , сорвало ба́шню, шарики за ро́лики заехали
 * Spanish: