Well, this doesn't apply as wacky more as unexpected.
I bought this a few years ago:
Now, I already had another copy, except not in as good as condition, printed on the back of a map which is not that uncommon for Belgian posters in wartime due to paper shortages, (although The Spy In Black in itself is hard to find original release paper on). On the back of this one was:
Belgian wartime posters being a quarter the size of their pre-war counterparts, this was apparently the bottom right hand portion of an earlier Belgian poster. I recognised Michel Simon in the artwork and that the film on which it was based was Boudu Saved From Drowning. If you check on EMP's and Heritage's auction histories there doesn't appear to have been any original paper sold on this title so the original poster recycled for the wartime printing would have been a rare thing (and a great film if you haven't seen it).
I'm never going to have the luxury of choosing but often wondered if I had the missing three portions for Boudu would I sacrifice the four smaller posters in order to restore the larger version?