Feeling glum or glib?

"I know what you're thinking about," said Tweedledee, "but it isn't so, nohow. " "Contrariwise," continued Tweedledee, "if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic." -Lewis Carroll,Through the Looking Glass.

Tired of losing arguments with your mates and family? Maybe Stephen's Guide to the Logical Fallacies makes for good Sunday reading.