An, actually to get an avocado pit out you whack it with the knife, not stick it. Best to do it on a cutting board and keep your hands out of the way.

Then to get the pit off the knife, you whack the knife handle on the edge of your trash can.

It is sort of like this, but I don't hold it.

https://www.youtube.com/watch?v=eGd6GfHG77I