I'm a bit of an eBayoholic, and as such I have a tendency to accrue the occasional bits and models that I have no immediate or concise plans for. Most often, they end up forgotten in the bottom of some bits box or other.
Yes... I have several...
Sometimes, though, the arrival of a new random bit seems to... 'resonate' with another unrelated piece of plastic. Recovering the old bit will often result in something I like the look of, but have no idea how to use on the tabletop.
Callidus/Culexus for my slow-off-the-ground Traitor Guards, perhaps?