Dear Evil Twin Seth,
We have been found out. We must flee and assume new identities! Under the middle drawer in your desk you will find a passport under a new name ("Beans Aranguren" -- memorize it!!), a one-way ticket to Rio de Janiero, pocket money in a dozen denominations and currencies, and (for protection) a feral Abyssinian cat. Take it all and meet me at the agreed-upon location! Hurry, before it is too late!
When something is late, it was Seth's task.
When a translation of the book into Cherokee incorrectly translates "Get the source from CPAN" to "I slept with your mother's goat, you owe me." It was Seth who did the translation.
And when the police knock at the door, it was Seth who was the one found at the scene holding the spatula, the sausage, and the half empty bottle of Ripple.