Ah, I've been meaning to post this and we've come right around to home improvement! I decided to tear out the drywall ceiling in a part of my circa 1930 house. I imagine it was installed in the late 70s. It's hard to explain exactly what this part of the house is, it WAS the back porch, but then made the sole access to the basement in the 50s. Then reworked again in the 70s. Anyhow, I tore the drywall down and found what everyone hopes to find: a fun new challenge!
Anyways, that's a 2x8 or so that is 80% air thanks to a past termite infestation, and I know there is other damage to the floor in the fully finished (but probably shouldn't have been) porch there. It's wild how rock solid this floor still is.
One thing I think is actually pretty cool is the way the termites ate only the spring wood, leaving the denser summer wood and leaving knots like this: