Phrases I Don't Understand. Any You Don't Get?

This refers to someone who will bitch about every tiny little thing regardless of how significant it is (IIRC new ropes are pricklier and more irritating to the neck than old, worn ropes).

I think the key to the saying is that they are bitching about an insignificant detail (the prickliness of the new rope) while ignoring the overwhelming important issue (they are about to die).

Speaking of vinegar, another one I don’t get is “you catch more flies with honey than vinegar,” meaning you can get ahead just by being nice to people. Why would you ever WANT to catch flies?

To kill them.

To keep them off you and what you’re eating.

http://boards.straightdope.com/sdmb/showpost.php?p=1027728&postcount=2

I think some people say, “In the best of all possible worlds,” when they mean to say, “In a perfect world”–though that wasn’t the idea of the original phrase.