While attempting to get her mouth around the sandwich, Peate says she experienced a sudden tongue "cramp."
Being a trooper, the 25-year-old still tried to finish her food with a fork and knife, but found that her mouth could no longer fully open.
The pain later spread to the rest of her head, and by the following day she realized she needed to seek medical attention.
An X-ray confirmed her suspicion: She had dislocated her jaw.
A doctor was able to realign her face with a quick thumb maneuver, and the pain immediately dissipated.
Peate suffers from a condition known as Ehlers-Danlos syndrome, meaning her joints are hyper-flexible.
The downside being that she has a higher risk of dislocation.
She was warned not to yawn too widely over the next two weeks, and to eat smaller hamburgers.
Being a "social media manager" by trade, some accused Peate of staging a stunt for a client.