Punctuation is a very weak point for a lot of people, and it is certainly nice to see some attention being paid to it.
Any punctuation pet peeves? Hehe. I'll start...
Braces. They are not brackets. They are called braces. { and }. They are also not called curly brackets. They have a name. How would you like it if someone called you the wrong name all the time?
Next: Ellipses... Three dots... Curt.
(Sorry - couldn't resist. But nice play on "he's" there!)
Which brings me to the m-dash... It has recently gained a lot of popularity but is almost always misused. Sigh... It is not a comma. It used similarly to parentheses.
I do really like the drunken punctuation from the chicken cartoon. I wish that was on my keyboard!