Here's a real oddity I found at the last Vintage Paper Fair: a postcard that is also a jigsaw puzzle. It shows no evidence of ever having been used as such: the pieces, though they do tempt one to the minor violence of pulling the whole thing apart, seem never to have been separated.
But what's really odd: the drawing style here. That two-pronged grey thing the man has over his arm is obviously a coat, but the more you look at it, the more it comes to resemble two big pieces of pipe or rubber tubing--or indeed a huge dissected blood vessel or a magnet or an oversize grey salami from the Twilight Zone. The man's left shoulder is equally peculiar: volumetric, suggestive of Dickon Crookback malformation. Strange little boot-shoe. I could go on.