OT: semi-OT: bilingual communication

I'm reading more on the North Caucasian languages (where I got A LOT of
ideas for Tech phonology). I understand that in Vladikavkaz, Russia, which
is on the Chechen-Ingush border, it's common for a Chechen to speak Chechen
to an Ingush, and the Ingush to reply in Ingush, and they understand each
other enough to hold an everyday conversation.

Is it possible, or practical, for this to happen in the real world for
speakers of two more different languages? Like I was speaking English to a
Spanish speaker and he'd be speaking Spanish to me.... ~Danny~

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