What's the biggest thing you've ever killed?
You ever killed something for fun?
Been hunting?
Slaughtered an animal to eat it?
Do you think twice before swatting a fly?
Ever killer a man? Seriously?
You a vegetarian?
Ever finished off a dying animal?
Have you got mice in your house?
Would you help euthanise a dying relative at their request, and with no risk of legal repercussions?
etc