Those who repeat history won't soon forget it. Guess your IM friends' next lines with the power of Markov chains and Adium logs.
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Imposter.xcodeproj
Imposter
readme.md

readme.md

Imposter

Those who repeat history won't soon forget it

Imposter finds a bunch of your Adium chat logs, picks the people you have talked to enough (they have sent you more than 100 messages) and generates putative messages from them based on Markov chain analysis on their previous messages.

See also: the Imposter site.

wat

Imposter leafs through what your IM friends said previously and tries to generate what they will say next based on this.

What is this I don't even

Deal with it.

Known bugs

Yes.

Sometimes HTML or attachment payloads leak into the logs. I have not yet put in the effort to filter this out.

Other than that, I bet it's perfect.