Friend’s BMW was getting serviced when Hurricane Sandy hit. Not only did BMW assign someone to help him with his insurance paperwork, as well as make them available to directly answer the adjuster’s questions, they also comped the service, cut him a cheque for the deductible and threw in a bunch of free tires and time on their racing track.

Lots of people post disclaimers claiming they aren't responsible for anything, so that you don't try to hold them accountable. Fewer of those will hold up as having as broad of a legal effect as they claim, but if they stop you from pursuing a claim in the first place, it doesn't matter if it has any legal effect at all.