Some synonyms for 'Exclamation Mark' from 'Graphics, design and printing terms', Lund Humphries, London 1989, Ken Garland. Elaboration by yours truly.
Astonisher
The Astonisher: part Bill Hicks, part Stephen Pinker, part Seth Godin. The Astonisher is on a mission to open up middle management mediocrity to the real possibilities if only they would think just free their minds and not just think outside the box, but reinvent the self same vessel.
Bang
As in Bill Lichtenstein Pop artist, as in DynamoBang (fantasy Russian football team, shapers of fine surf equipment, sculptors of cream cheese and dry-stone wall champions).
Shriek
Horrible, horrible looking word. People who 'shriek with laughter' are just the same. Was the character Shrek a result of a typo?
Striker
Football. Comic. Enough said.
Screamer
Firework, or maybe a huge mistake. Sometimes the above let these loose in a game of football.
Dog's cock
OK, a more PC version would be 'the dog's bollocks', after all, I wouldn't put a dog's cock on my blog. But I will recommend Billy Connolly at the Albert Hall and his meeting with Chick Murray his banjo teacher on this subject.