Many years ago, I worked on a project in Tennessee where the bank was installing computers in their branches (previously the tellers were using mainframe terminals). At the same time, they were consolidating the leased data lines to the branches to save money, as everything there was now a network device - including the ATMs.

The IBM representative on our team was working behind the through-the-wall ATM, routing some wires when a customer walked up (you could see them via the camera). Being a prankster, he started talking to her in a robotic voice: "Please insert card", "Please choose a transaction", etc. After a few of these he couldn't hold back any further and started laughing. The customer got the joke and started laughing too: "I knew someone was back there!"

Briefly, he was their first (and only) talking ATM.