[RogerBW]

The closest I've come was with Selective Amnesia: my AI character in a Transhuman Space game has memories that start with its applying for political asylum within the EU. It's worked out that it did something for the TSA during the war, but has no idea what.

(Arguably this could have been done as the Partial version but as far as I remember the GM and I didn't feel that the lost past should come up as a major important element in the game.)

For comic effect, it would occasionally come out with lines like "oh, this reminds me of that time that null pointer exception".