I do tend to go off on tangents, as well, actually, and leave people blinking, wondering where I am going.
Actually my phrase of choice is "I digress". (then you don't digress, you only SORT OF digress, and this makes you look complicated.) ;)
But I digress.
Yes, I have been known to go on tangents.
One of my favorite tangents is the abuse and degeneration of the English Language, and how this is subtly (or sometimes not-so-subtly) different than the natural changing of the language over time, as a living language.
Just about nothing sets me off like Apostrophe Abuse in professionally published websites, books, and periodicals. Ooooh I could go on for hours, but
I digress.
The important thing for an effective tangenter, is that when you digress (or diverge) you must bring your audience back to the original subject, and if you have done this, you have tangented with excellence.
But this really hasn't got much to do with...ahem...the subject, so I digress.
Narnia vs Tolkien...? I don't want to make that decision.
"If you believe what you like in the Gospel, and reject what you don't like, it is not the Gospel you believe, but yourself."--St. Augustine of Hippo