Hmmmmmm, I guess it depends what you mean by Wierd/Cool.
The one that's the most Wow! factor on the shelf is probably the Bell & Howell three lens turret Super 8 movie cam. A real piece of beautiful engineering.
Odd, or gets the most looks when being used, then I guess the Minox 8x11's are up there.
But the one that gets people stopping and staring is the Linhof Technika 23......
However, to me, the coolest camera I own is my Leica IIIf with 50 Summitar. That thing is just waaay cool....