When Mr. Banks returns home to find Miss Andrew gone, Mrs. Banks (not knowing that Mary Poppins scared Miss Andrew into leaving) explains that the children acted so rude, she left early. Mr. Banks scolds Jane and Michael, but also gives each of them sixpence as thanks.
I'm a most unfortunate man," he went on, putting his hands into his pockets. "Here am I slaving day in and day out to bring you up properly, and how do you repay me? By being rude to Miss Andrew! It's shameful! It's outrageous. I don't know that I shall ever be able to forgive you. But——" he continued, taking two sixpences out of his pocket and solemnly offering one to each of them, "I shall do my best to forget!"
While Jane and Michael call each other ugly, Mary Poppins ends the fight by telling them that the most beautiful person in the house is "nobody by the name of Banks!"
The 'I Love To Laugh' scene.
Bert's joke to Mary's old uncle made me laugh. Despite the fact that it really wasn't a very good joke.
Bert: I always say there's nothing like a good joke.
Uncle Albert: (sobbing) No, and that was nothing like a good joke.
Admiral Boom, especially when he orders the attack on the 'hot-n-tots'.
Mrs. Brill in 'Step In Time'; she sees an army of chimney sweepers and screams, "THEY'RE AT IT AGAIN!" Then tries to fight them with a frying pan. What's not to love?
Or when the maid screams, and they respond? "Aaah! Step in time!"
Or when the maid sees the dad walk in...horrified.
However, Mrs. Banks really takes away the gold for that scene. She walks into the room, acting as if everything is normal. Then gets grabbed by the sweepers and all she can say is, "Oh no really, not at the moment." But the best part is right after, when the men cry out "VOTES FOR WOMEN" at the top of their lungs. What does she do? Naturally, she joins in!
That bit at the end with the last sweeper running to catch up with the others was good, too.
Mrs. Banks had another good moment with her line "Oh, George! You didn't jump in the river! How sensible of you!"
But the Crowning Moment of Funny has to go to Mr. Dawes Sr.(Dick Van Dyke) after he muddles over Bank's joke and really starts to get into it. It's awesome watching him shoot up into the air like a rocket laughing only for Jr. to cry, "FATHER! COME BACK! DADDY!!!"
The story of how Glynis Johns was hired: she would only do it if she got her own song, so the Sherman Brothers quickly changed the lyrics of a Mary song that they'd discarded. The song, of course, was "Sister Suffragette", and Glynis sang the hell out of it, despite her limited vocal range. She would later go on to originate the role of Desiree in Stephen Sondheim's A Little Night Music, where she sang "Send in the Clowns" to great acclaim.
Anytime the cannon is fired and what happens in the household before and after it happens.
When Admiral Boom breaks up the rooftop Step In Time with fireworks, Bert sends one back by using his sweeper like a cricket bat. The pipes Michael stands behind look like wickets, making him the wicket keeper. Boom yells, "Well hit, sir! Well hit!" before ducking.
It's even funnier because he makes that demented face for literally no reason.
Mr. Banks: And one more thing, when I sit down to play the piano, I expect it to be in tune!
Mrs. Banks: But George...you don't play.
Mr. Banks: Madam! That is entirely beside the point!
The Constable talking to the Inspector:
Constable Jones: He's been found! No, alive... while I assume he's so, he's here kissing the missus.
Constable Jones: (on the phone to the Inspector) That's what I said, sir. Go fly a kite! No.. sir, I don't mean you personally.
The umbrella mouthing off, and Mary Poppins clamps his mouth shut.
Mary: Close your mouth, Michael, we are not a codfish.
After Mr. Banks hires Mary Poppins, he tells the maid to tell the other nannies that the position has been filled. The maid is understandably confused, because Mary Poppins was the only one at the door after blowing the other nannies away, but she goes to the door and tells the dog, "The position has been filled."
During Jane and Michael's letter of the perfect nanny, one of the requirements is "never smell of barley water"note Alcohol. Michael enthusiastically says he thought of that and George has a very disapproving look on his face. But Winifred is trying to restrain herself.
When Mary Poppins arrives and begins reading the children's advertisement, Mr Banks goes over to peer into the fireplace where he'd thrown it. He then bumps his head on the fireplace, splutters, and mimes tearing up the letter. Mary Poppin's reaction - "I beg your pardon, are you ill?"
Then Mrs Banks comes in a few moments later and calls "George!" Mr Banks bumps his head on the fireplace again.
The expression on Ellen's face when she witnesses Mary and the children sliding down the railing is priceless.