YesIknowitsThursday. I was busy yesterday. Anyway, check this this out:

This is billed as a “kinematic” knife and opens thusly:

You can easily flip it open with your thumb if you have your index finger through the ring, and it turns into a reverse grip karambit.

Unlocking it is a bit of a faff and I haven’t figured out how to do that with one hand yet, but opening it is very fast and the mechanism is fun to play with. I have no other use case for it.