Douglas Adams referred, I think, to all the lost biros that went missing, suggesting they all migrated to some biro planet where they lived a fulfilled life. My office has a similar problem with scissors. I start off with two pairs on my desk and within forty-eight hours I have none.
I've tried searching the house - I do sometimes find them, but more often than not I'm lucky if I can unearth a pair of kitchen scissors or nail clippers.
So a while ago I bought a whole batch of scissors from my supplier and now I keep replacing them as they disappear. I have the theory that if I inject enough into the system, eventually we'll hit saturation and they won't disappear any more.
I haven't made it yet. They still keep disappearing. But the act of opening a fresh packet has started to take on a new significance. I feel like a naturalist, releasing an animal bred in captivity back into the wild. It's strangely satisfying.