I'm not really calling Benjamin a jerk and he hasn't become "Damien" from the Omen movies, but he is definitely testing the limits.
For instance, if he's messing with an object he desires (phone, marker, remote, gold bullion) and we don't let him have it, he will run away squealing from us and then throw said object into the corner.
THEN, if we put the object back he will go back over to it, look you right in the eye and zing the object haphazardly behind him. And the look on his face says, "Oh yeah, you want this so much, go get it (ZING!)" There are some choice days where we call timeout for him more than the last 2 minutes of an NBA game.
And the absolute worse part is when he does the "Marlin" - a full body contort were his head and feet stiffen and fling in the opposite direction from his body. Much like a marlin jumping up out of the water and flopping around on the deck of your boat. At least now I know what it's like to be headbutted and kicked in the ribs at the same time. I could soooo make it in the UFC.
For full disclosure, he still has plenty of good moments and isn't filled with vinegar that often. The times that he has an attitude make up probably 5%, but going from 0% to 5% makes you think "oh no, is this it? Is the cheese sliding off his cracker? What did we do wrong? Whose teaching him this stuff?" Like everything else in the media, I guess we should blame the parents. Wait a second...