I live in an apartment with several other people, and we all contribute to the kitchen. I am a bit of a foodie (obviously, seeing as I read chowhound) and I brought a bunch of my favorite kitchen equipment, including my super sharp chef's knife. The other day I saw my roommate mincing garlic with my knife, and I'm pretty sure she has no knife skills to speak of. I was terrified watching her fingertips get so close. I don't care if she uses the knife, but I do not want to be responsible for any chopped off fingers. I tried to tell her that it would be better to curl her fingers under but she ignored my advice. I don't want to come off as a snob/know-it-all, but how can I tactfully tell her that she really needs to use proper knife skills?