WATCH: MSU Orders a Pizza From a Talking Computer, 1974
According to this video's description, it's "the first use of a speech prosthesis in history: the use by a man with a communication disorder to order a pizza over the telephone using a voice synthesizer."
After 5 tries - and rejections from Lansing area pizza parlors who probably thought these were prank calls - a local pizza establishment finally relinquished and took the pizza order.
Watching, this, it's understandable why someone on the other end of the line would think it was a hoax...but it has a triumphant ending.
Another pretty impressive event by MSU, and the state of Michigan...take a look!