Yiddish: When the crickets play, the bedbugs dance.

Response when one is told something nonsensical or absurd.
SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten.

‏שפּילן די גרילן, טאַנצן די וואַנצן.

Shpiln di griln, tantsn di vantsn.

When the crickets play, the bedbugs dance.