- Health.SE doesn't allow questions on personal health due to liability
- Law.SE doesn't allow questions on personal legal quandaries for similar reasons
- Mechanics.SE and DIY.SE Don't have active policies, but they downvote (into oblivion) questions where the user shows a lack of understanding and might hurt themselves based on what they're asking how to do.
Someone recently proposed a question asking for help on how to circumvent safety mechanisms in place by his company. I could see similar questions on how to prevent the safety lock on a lighter, workaround lockout procedures, etc. It seems like life hacks might be the kind of place individuals would come to find this kind of information. For Liability reasons (among others) I'm fairly certain this is the type of question SE should avoid answering, and discourage the asking of.