Identify Scrolls
Blessed scrolls of identify will sometimes ask you to choose an item, and only after you've chosen one will it identify your entire inventory. This happened to me:
I read a scroll. I had two blessed ones, and one uncursed one, although I didn't know the status. I happened to read one of the blessed ones, I chose to identify my (uncursed) bracers of (protection). It identified my entire inventory.
I have also had it just succeed without asking me to pick an item.