Terry Pratchett. The Thief Of Time (№ 87953)

All the fingers were clenched, except the middle.
- You know what that mean, monk?
- Not too friendly of a gesture, PAL.
Oh, very superficial interpretation. Tell me what you mean, and understand who I am.
Is your middle finger?
- Fu...
fu?
- Yes, phew! You have brains, use them!