The lazy way (which is still arguably better than answering truthfully) is to use the same answer for all the security questions. The better way is to treat each answer as another password and encrypt and store the answers somewhere safe.
Realistically how many people outside (or even inside) HN are going to do that? No matter how you spin it, security questions are a very bad "security pattern" in my opinion and we should get rid of them.
I do that, the security questions and answers just get added to the site's entry in 1Password.
I use KeyPass and save all the security questions and answers too. I should use fake answers next time though...