Sympathy for the Devil: Gives this towards Frank in "Jack Stands Alone", especially after seeing him as an emotional wreck at Falafel Phil's.
Taking the Bullet: Did this for Kim in the episode The Wrath of Swan, but it didn't do much good, because Kim still ended up messy anyway.
Took a Level in Dumbass: In Season 1, Jack was not only the most skilled student in the dojo, but he was usually the one who would come up with a plan to the gang's current situation. In Season 2's "The Chosen One", Jack was more concerned about his hair being shaved than saving the Grandmaster Monk. In "Wedding Crashers", Jack picks up one of Bobby's movie props and accidentally shoots Jerry in the mouth paralyzing him.
Lethal Chef: Milton received a D- in Home Ec because his cake resulted in the teacher running to the bathroom. When he was baking his second cake, problems arose, when he added a few drops of chemicals in the bowl, the table the bowl is on shook, before he put the cake pan in the oven, the batter is bubbled like boiling lava, when the pan is placed in the oven, the kitchen cabinets all shook violently, and when the cake is finished, it is edible, but due to all the chemicals Milton put in the cake, it blew up after coming in contact with precious metals, namely, the teacher's golden fork.
What an Idiot: Ironic, since he's the smart one, but in Karate Games, Jerry spots a guy with orange pants and Milton just thinks the man is brave to wear orange after Labor Day. When Jerry and Eddie tell him he's an escaped convict, Milton says he's going to "subtly tell the police helicopter of the convict's location". Yet, his idea of "subtle" is to stand on a chair, yell into the sky which ends up warning the convict to try to run away.
Zettai Ryouiki: When not wearing his gi, he almost always wears shorts and kneesocks.
Berserk Button: Apparently, implying/saying Kim is a Dumb Blonde is NOT a good idea. She was ready to hurt Milton (who was pretending to be Jerry as part of a plan) when he said "Forgot I was talking to a blonde".
Badass Decay/Diminishing Villain Threat: Frank has arguably become this in season 3 where instead of being a bully, he's turned into a prankster and the other kids at school have gone from scared to annoyed, or in Erica's case, angered.
No Doubt The Years Have Changed Me: As the series began, Bobby Wasabi was a former movie star who hasn't been seen in public for at least two decades. When he first made an appearance, he was so overweight people had problem linking him to the movie star. No wonder the producers making a movie of his life wanted him to be portrayed by somebody else.