Re: 'You brought nothing to the party but a six pack of regret?'
It's a reference to an old folk remedy against rabies. You have to consume a hair of the dog which bit you. A sort of sympathetic magin thing. The homeopaths are into that and there is doubtless a 1000C tincture of hair of the dog available as a tonic to ease your attachment to a former loved one (dogs being very faithful). That's how the 'logic' works.