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Things I don't understand are happening, and there's more to it than my overactive imagination.

On one fateful night, his overactive imagination gets the better of him.

So far all he had evidence for was an overactive imagination.

It almost seemed as if the whole business had been the result of an overactive imagination.

You think it's all in my mind and that nothing is wrong with me but an overactive imagination.

Did she hear the panting again or was her overactive imagination at work?

The police think that her story is the product of an overactive imagination.

Now, come on, isn't that just a product of some overactive imaginations?

It seemed she had inherited her overactive imagination from him.

It might all just be his overactive imagination, he reminded himself, and there was one way to find out.