Name a CD you own that you think no-one else on your friends list does.
Too many options. How about Koenjihyakkei - Hundred Sights of Koenji? Or Strangulated Beatoffs - Reverse Child Psychology.
Name a book you own that you think no-one else on your friends list does.
The Liar by Stephen Fry
Name a movie you own on DVD/VHS/whatever that you think no-one else on your friends list does.
Nosferatu by F. W. Murnau
Name a place that you have visited that you think no-one else on your friends list has.
Gresham, Oregon.