Well since Corbyn managed to secure 40% of the national vote, Goodwin, co-author of Brexit: Why Britain voted to leave the European Union, just kept his promise by embarking on that very task on Sky News.
Like many pundits, Kent University's Matthew Goodwin doubted Jeremy Corbyn's party would poll anywhere near a win. Prime Minister Theresa May and her Conservative Party's representation in Parliament fell to 318 MPs - eight seats shy of keeping an outright majority in the Parliament - while Corbyn's Labour Party brought their representation to 262 MPs. "I will happily eat my new Brexit book if they do", he had tweeted.
If you found the British election result hard to stomach, spare a thought for a politics professor who ate a copy of his own book on live TV after losing a public bet on Labour's support. "I did say I would eat this book".
"I am a man of my words".
Goodwin scrunched up a piece of paper and uncomfortably shoved it into his mouth and said: "It is actually a hardback, there are lots of chemicals but I have got to get through the whole thing".
Later, a Sky News producer tweeted that Goodwin did not swallow the page he was munching on, the report added.