Okay, so, I've been stuck with half-baked ideas for a few months. So far I haven't been able to make much (if any) progress.
They are as follows:
Some sort of item (keys?) that are never where you think they are, and cause other things to go missing as well.
An interdimensional matter cannon.
A device in which, if two samples are placed within, end up with some sort of fusion of the two materials. Most tests with human DNA and any other sort of material end with "OH GOD, KILL IT WITH FIRE".
So, uh, yeah. .n.