Matt,
Just like on CSI? I always yell at the TV (yeah, I know) telling them to turn on the damn lights.

Yep, I have popped a few in attics and crawlspaces. I usually don't turn them on in crawlspaces, but always do in attics. Hmmmmm. Got me thinking now.
I wear a cap, so at least I don't get my bare skin cut up.
JF