1. dissonance - as Webster has it, inharmonious sounds. Used deliberately by many great musicians from Lou Reed to Sonic Youth to Mogwai, as an art unto itself or an extreme method of tension and release.

2. cognitive dissonance - an incongruity of thought or conflicting ideals...go there

3. social dissonance - conflict within a cultural, social or political landscape. Can be either accidental, or as a result of culture jamming by activists with the intention of highlighting hypocrisy. Example: the presence of a giant skull in a hacked cigarette billboard.

4. Amoebic Dissonance - the e-zine that's almost a viral infection (http://come.to/amoebic)

5. Tom Dissonance - to be honest, I wouldn't even bother