Flipping tools?
That somewhat goes along with flipping houses...
Or flipping stocks and commodities...
Uh, yeah, that always works out well in the end, doesn't it...
Cotter pin puller (craftsman) - It has surprised me over the years how many times I've used that thing to do something (unrelated to cotter pins at all)
RoboGrip pliers - I've had the same set since they first came out and go to them frequently
Spyderco Delica knife - most used tool of all...