Can't remember what, probably 'do you have a Nectar card?' or sthing. The lady was quite old, and wearing niqab, so he couldn't see her face, but she just tilted her head to the side like she didn't understand and this kid immediately switched language and asked again.
Another head tilt.
And he asked again, this time in a new language.
She got it, and chatted back to him.
Blew my mind, honestly. This kid who was working a shift in Sainsbury's was just CASUALLY TRILINGUAL.