I typically ask them what they need to cut and then cut it for them. I have had too many issues with lending things, not just knives. My dad always told me don't lend your stuff if you don't want it damaged and don't borrow from other people if you can't afford to fix or replace it if something happens. I watched a buddy take another buddies snowmobile for a rip once. He jumped on, drove 300 yards, and the crank shaft snapped. Neighbour borrowed my chainsaw, stuck it in the gravel and toasted the chain. I loaned my truck to a buddy, he backed into a concrete bird bath and dented the tail gate in. 8 years and the dent is still there.