A Facebook friend points out that those Catholics who support "gay marriage" use anecdote the same way the proponents for Lying do. He calls the use of anecdotes in these cases "an emotional device to avoid sinful behavior". Or, I would say, to avoid thought.
Thus, you can side-step the principle that the Church teaches that Lying is always wrong by bringing up an anecdote that makes an emotional common sense appeal - "What should I tell my wife if she asks me if this dress makes her look fat?" Such an anecdotal hypothetical skirts the principle and distracts by focusing on a feeling.
Likewise, you can side-step the nature of marriage altogether by saying, "My nephew was seriously depressed, but ever since he went to New York and married his gay lover, he's been very happy."
So, Lying Apologists, watch out. Your techniques can be used by folk whose heresies you would normally abhor.