it takes one to know one

Proverb

 * Bob: You're an idiot!
 * Tony: Takes one to know one!
 * Bob: You're an idiot!
 * Tony: Takes one to know one!

Translations

 * Catalan: pensa el lladre que tothom roba
 * Danish: tyv tror, at hver mand stjæler
 * Finnish: kyllä koira koiran tuntee
 * French:
 * German: Alles, was ich denk' und tu', trau' ich auch dem andern zu
 * Irish: aithníonn ciaróg ciaróg eile
 * Italian: il bue che dice cornuto all'asino
 * Polish: swój swojego zawsze pozna
 * Portuguese:
 * Russian: каждый судит по себе
 * Spanish: piensa el ladrón que todos son de su condición