If it was a "PF-Blow to the Head" penalty, then I want Flacco's fumble against Pittsburgh called a "PF-Helmet to Helmet on the QB".

On that play, Harrison's helmet hit Joe in the cheek. It wasn't malicious, or even intentional, but the officiating should be consistent. If any brush on the helmet is gonna be "blow to the head", than any helmet contact should be a PF too.