Peter,Was it Mark Twain who commented about a guy who could cuss for 20 minutes and never use an unprintable word? My personal favorite (to use) is "You pusillanimous non-entity! I shall defenestrate you!" and watch their jaws as they to figure out what you just said. 'Couse as David says when I get really mad I just switch to Turkish.
CamiSu (who has PLENTY of Scottish blood--Fraser, not Cameron!)