otro gallo cantaría

Etymology
The full phrase is "Si Pedro no hubiera negado a Jesucristo tres veces, otro gallo cantaría", meaning "if Peter hadn't denied Jesus three times, another cockerel would sing", in reference to the biblical story of the.

Phrase

 * 1) woulda, coulda, shoulda; if pigs had wings they would fly; if my aunt had balls, she'd be my uncle