A curious edition of Flatland, published by the Arion Press, with an introduction by Ray Bradbury. It's printed on 56 accordion folded pages (so you can lay out the whole text... flat) and housed in an aluminum case.
If that's not wacky enough... The Robin Book:
If that's not pretty enough, then how about the Kelmscott Press (William Morris) Works of Chaucer:
If that's not racy enough, imagine having to compose a properly dry auction catalog entry for this:
"An unusual, unexpected, and very erotically graphic publication that touches on all manner of taboos and the employment of otherwise innocent items like pickles."