I feel like I've been collecting so long I have almost completely lost my sense of "weird".
I have a box of stuff from one rescue I labeled "inexplicable lundberg devices", half-full of homebrew interface boxes and odd cables. I still don't know which of the 8-bit micros from that rescue they're meant to be used with, never mind what their purposes may be. They are definitely weird. I don't know that they're particularly interesting, though. My sense is they're mainly like "reset button for a ZX-80" type not-particularly-interesting.
Most of the properly interesting things I've collected, though, I have a hard time considering "weird". Unusual, or out of the ordinary, sure. But not weird.
I guess I could find a way to consider the DuPont MacBlitz card "weird". What makes it weird to me is that anyone would have thought that it made enough sense to create as a product in the first place. Or, for that matter, the Apollo DN660. Apollo engineered a full two-board bit-sliced CPU to emulate the MC68020 and then designed the DN660 around that, when they might've just waited six months or so for Motorola to begin shipping the actual MC68020. That seems pretty weird to me, but OTOH does a lot to explain the kind of engineering culture that I imagine contributed significantly to Apollo's continually dire financial straits.