out of curiosity
She did it out of curiosity.
Je m'y suis rendu par curiosité.
I went there out of curiosity.
Par curiosité, je pris le sien.
Out of curiosity, I took his.
Just out of curiosity.
Par curiosité, parce que ce serait dans mes cordes.
Out of curiosity, because it would be within my capabilities.
Par curiosité, Miranda, tu y as mis de la menthe ?
Out of curiosity, Miranda, did you add mint to it?
— Amarcord (1973)
He did it out of curiosity.