Electronic devices that talk with many voices.
If you've spent more than a few minutes with a Speak&Math you may have noticed that one voice sample that doesn't match the others – the clip announcing the game "Greater Than / Less Than". It sounds like a whole different person recorded it because... that's what happened. (For the curious, http://www.99er.net/spkmath.html explains!) This was a haunting fascination for a much younger me.
Fast forward nearly four decades to now; the device in question is a cheap but perfectly functional Bluetooth adapter for my headphones. Most of the voice clips ("device on", "power low", and so on) are kinda low-quality, noisy, trimmed-too-short recordings of someone with a difficult-to-place North American accent... but one or two clips sound like they were recorded with a somewhat improved setup a feature a wholly different voice with a British accent. Nowadays, this doesn't seem wondrous so much as careless, but it's still fascinating.
Anyone got any other interesting examples of this multiple-voice phenomenon?
re: Electronic devices that talk with many voices.
@Doephin I can't decide if that's surprising to me or not. I feel like Google products are one big psychological experiment to start with.