I remember picking up the conversation coming from a hot air balloon one day I was playing on the computer. I was focused on the game, and suddenly these voices

I remember picking up the conversation coming from a hot air balloon one day I was playing on the computer. I was focused on the game, and suddenly these voices start overlapping with the sounds I'm used. Today I'm not even sure it was possible. The speakers were that kind that made a noise when receiving or sending an SMS from a nearby mobile phone.