Bc4! with an exclaimation mark??? 

 
Who the heck put 4. Bc4 with an exclamation mark? That move isn't even in the MCO 14. My chess analysis engines are putting it as third favourite move. Both of the reponses Be7 and Nf6 to it were put with question marks after them when both of those are great moves. 

I see this opening all the time in blitz, there is no "giving away a pawn". Ridiculous.