Here is the interrobang, in case anyone needs a big look at it:
Interrogative mark (question mark)+bang (exclaimation-mark in printer- and geek- speak)=interrobang. It was developed to simplify sentences such as the following:
You can't be serious !?
Informational links can be found at Blue Dog Blog™ at the link above. I wanted to mention it because, hey, it's type and hey, it's cool when someone brings the old interrobang out to play.