Okay, cleaning can be fun -- not only am I finding documentary evidence of interesting and ancient purchases (my first hard drive, a spacious 20MB, bought in 1988 for a mere $238), but also evidence of trips I'd long forgotten, meals at restaurants I would never remember visiting, and long-ago-closed bank accounts at financial institutions that are themselves long-ago-closed.
I'll keep a few choice souvenirs... but all the rest is headed for fiery oblivion.