Coworker: So. We've had a few weeks with almost 10% double entries. You have to be more careful about that.
Me: Oh crap. When was that?
Coworker: December 2011.
Me: Oh. Well, I've only been working here since February.
Coworker: So?
Me: So I wasn't here in December.
Coworker: ...So?
Me: So, it clearly wasn't me.
Coworker: How do you know?
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