who knows
Vete a saber.
Who knows?
— Los lunes al sol (2002)
No me elegiría él, sino el productor o vete a saber quién.
He wouldn't choose me, the producer would, or who knows who.
— La noche americana (1973)
Vete a saber qué más.
Who knows what else.
O sea, que vete a saber.
I mean, who knows.
— [REC] (2007)