LONDON -- In the same way that the Harry Potter books have the ability to flit seamlessly between comedy and drama, J.K. Rowling is just as adept as switching between jokes and brilliant advice on her Twitter account.

Her tweets on Tuesday morning -- which started with a joke about the dangers of carrying your MacBook across the lawn, and ended up with some serious writing advice -- are the perfect example of this.

It started with a tea break.

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We soon discovered Rowling has an outdoor writing room.

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And then, to finish, she had a memorable piece of advice for budding novelists.

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That's a good one to remember if you're ever tempted to give up on your writing dream.