If you've got short, stubby fingers and wear reading glasses, any relaxation you would normally derive from fly fishing is completely eliminated when you try to tie on a fly.

Yes, I actually have a portable fly-tying kit in my vest. I spent hours putting it all together, with a special emphasis on midge materials as well as enough fur and feathers to whip out a half dozen of virtually every conceivable dry pattern nature can throw at me. I have used it once, in 1993.

Terrorism really doesn't strike at physical structures as much as it strikes at ideas, and its main fear is ideas. And cartoonists are particularly effective at distilling ideas.