Aww, a smile like that would melt anyone's heart.
OR
Whenever Ugluk gets upset, all of his facial muscles contract and almost pull his face apart.
OR
Ugluk is going to kill whoever it was that painted an 'X' on his chin during the night.
OR
Ugluk: "What do you mean this is Mordor?! I'm trying to go to Isengard, and I know I followed the directions. Ohh! I hate MapQuest!"