i only personally possess three Pratchett books, two Gaiman and one David Adams:

Truckers
Thud
Where's My Cow

Coraline
Neverwhere

The Hitchhiker's Guide

the rest of the books by all three authors are owned by my father; my copies live on his bookshelf if i'm not at college. This way, we have the Dad 'n' Amy Book Collective.

I do mean to buy the Dad 'n' Amy Book Collective matching copies of the new double edition of Good Omens, though ;)