Utah, USU and now BSU fans love to pull it out in all its forms. It truly is the dumbest kind of smack. Especially when it is your own religion and the school is owned by your church and aspires to standards you yourself do as well as a member of said faith.
The best smack talk starts and ends with what happens between the lines. Which is why BYU fans can't really smack Utah or BSU successfully right now, but still can with USU due to historic and recent trends.
And Book of Mormon smack? Seriously? Nerd alert.