David Walliams was forced to eat a rat burger by Bear Grylls when filming the adventurer's 'Mission With' documentary.
David Walliams
The 47-year-old actor says the 44-year-old television presenter cooked and served him a rat burger - which is also the same name of his hit children's book - for his ITV show.
The 'Britain's Got Talent' judge said: "Bear made me eat a rat. He cooked it first but I would not recommend it. He is saying, 'Oh it is delicious, it's wonderful'.
"I am like, 'It is not'. There is a reason why we don't eat rats.
"There is quite a pooey after-taste.
"So I have kind of got my just desserts writing a story about Ratburgers and now I have had to eat one."
David came up with the idea of 'Ratburger' - which tells the story of a man, Burger Man Burt, who makes burgers from rodents - after he was left shocked by a 'BGT' star who ate live cockroaches as his party trick.
This comes after David's model ex-wife Lara Stone banned him from rock climbing with Bear in 2012.
David said: "Just after the Thames swim we went to New York.
"Lara had to go for fashion week, and I wanted to get away. I'd had so much attention.
"I'm friends with Bear and he was there too.
"It was only scaling a rock face, but Lara got really upset and said 'no'."
In his show, the survival specialist puts eight celebrities to the test and makes them face a 12-day survival mission like nothing they have ever experienced before.
To stay alive the stars must learn how to navigate difficult terrain, build shelter and catch their own food.
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