Penny Arcade have been running a public information campaign on punctuation for a few years now...
http://www.penny-arcade.com/comic/2003/07/07
(and http://www.penny-arcade.com/archive/results/search&keywords=... )
http://www.penny-arcade.com/comic/2003/07/07
(and http://www.penny-arcade.com/archive/results/search&keywords=... )
http://www.penny-arcade.com/comic/2005/09/02
Definitely a pissed-off period.
Did not know that when clicked.