"How is your memory holding up?"
"Is it bad I can't remember before third grade?"
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.
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"...Do you think you're ever going to forget me?"

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.
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Bill S. Preston, Esquire is being erased from time. In approximately one month, he is going to forget everything. And then he will be gone for good.

As his memory fades and dwindles, and he finds himself reliving only the worst days of his life.

There doesn't seem to be any way to stop it.

In one month, Ted's best friend will not only be gone, but he will have never existed in the first place.

But they'll always have one last night in San Dimas.