Jasmine punching out one of the forty thieves, complete with this line.
Jasmine: That was for ruining my wedding!
Iago's 180 (well, maybe 150) character change, from Chaotic Neutral scoundrel to reluctant hero to Not-So-Chaotic Neutral scoundrel, at the end of the Aladdin movies. Summed up well with his final line, when he throws in his lot with Aladdin's treasure-hunting father:
Iago: You're a good guy, Cassim. But not too good!
Instead of fleeing when the forty thieves break up the wedding, Iago actively defends the gifts from Cassim, wielding a vase like a bat. Greed was probably his main motive, but it still takes a lot of guts to stand up to a masked man several times your size.
This one is even better in Swedish where the last line is: "Say 'cracker' and you'll never see the sun rise again!"
When Aladdin finds Cassim, he's also captured by the Forty Thieves. Here's the problem; if Cassim shows Aladdin mercy, he'll look soft in the eyes of his men, but he doesn't want to kill his long-lost son. So, he convinces them to give Aladdin a fighting chance, and not by outright saying it. He dithers over the subject, dragging it out so much that everyone, even his loudest critic Sa'luk becomes interested in this Third Option Cassim is mulling over. Being a Guile Hero must run in the family.
Sa'luk not only surviving what first seemed like a standard Disney Villain Death, but also killing a shark while in the water was pretty badass.
Cassim finally getting the hand of Midas. With his cape turned to dazzling gold, the first thing he does with it is turn the whole temple gold.
During the 40 Thieves' raid on the wedding in the beginning, while Aladdin is facing the King, the rest of the gang starts making progress against the raiders. Then Genie steps in and single-handedly chases them off. His power may be reduced to semi-phenominal, nearly cosmic, but even Sa'luk didn't want to fight the Genie.
Sa'luk: Cassim said nothing about facing the powers of a genie!
To save his son's life, Cassim throws the Hand of Midas to Sa'luk, who catches it by the golden hand. Sa'luk proceeds to claim it's his, and also Aladdin's life now... but Cassim merely smirks a little; he knows he's already won.
It must be said that this, just like when Cassim caught the Hand with his cape (as mentioned above), is a sign of his guile - it's a good sign of how he took control of the thieves back then, and he proves it here because he knows that Sa'luk will make the fatal mistake of catching it with his hand (which most people will attempt, rather than using their brains like him). Suddenly it makes sense that the violent Blood Knight (implicitly) lost leadership from him, and it parallels his son's cunning defeat of Jafar in the first movie - we know where he gets his wits from now.
Added to this is that Aladdin, intentionally or not, added to this by kicking Sa'luk's foot since it knocked him off-balance, making it more likely he'd catch the Hand with his hand.
The scene where Aladdin and Cassim have their falling out is both sad and as well as awesome. Aladdin would rather spend his life in prison than allow Jasmine to endure the pain of him leaving her. It is probably the most mature thing Aladdin has said as well as done in the whole series.
Aladdin's noble decision to save his father from Sa'luk despite his father's selfish actions.
(Iago screams as he falls out from the sky bouncing off Carpet. Jasmine catches him) Iago (out of breath): Al's...dad...Sa'luk! Jasmine: Just take a deep breath, Iago. Now what about Aladdin's father? Iago: It's Sa'luk, the guy Al beat! He's NOT beat! He's back! And he's got Cassim! Aladdin (stubbornly): That's his problem! He chose to go back to that life! Genie: Al, I know your dad made a lot of bad choices—but that doesn't mean you have to. Jasmine: He is your father. How can you do anything else? Aladdin: I'm being as stubborn as he was... (Al sulks for a moment...then, after a pause, he turns back with a bold grin') Show me the way! (Jasmine, Abu, Iago, and Genie smile grandly)