Sir David Attenborough: I was a real little monkey
The award-winning Frozen Planet host told a documentary he was a rebel who liked a practical joke.
Sir David said: "I had rotten reports until I was 16. I didn't take to discipline all that easily and found a lot of lessons profoundly boring."
He and his pals at Leicester's Wyggeston Grammar School For Boys got into all kinds of scrapes.
He revealed: "We climbed into a junk room and re-arranged piping so if you pulled the bottom it would all collapse. We then took a wire connected to the piping and put it through my desk.
As a youth ... David Attenborough
"I yanked it and there was an explosion. It was a great do." Sir David attended the school during the Second World War when retired staff were drafted in to replace those called up.
He said: "Some teachers were in their late 60s and we were a handful. If it was a boring lesson, they had a job keeping us in order."
But despite his poor behaviour, David won a scholarship to Cambridge University to study Natural History.
Ex Tory minister Edwina Currie is among others interviewed for The Grammar School: A Secret History which begins on BBC4 at 9pm on Thursday.
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