<P> On another outing, the four meet Uncle Albert, who has floated up in the air due to his uncontrollable laughter; they join him for a tea party on the ceiling, telling jokes . </P> <P> Mr. Banks becomes annoyed by his family's cheery atmosphere, and threatens to fire Mary Poppins . Instead, Mary Poppins inverts his attempt by convincing him to take the children to the bank for a day . Mr. Banks takes Jane and Michael to the bank, where they meet Mr. Dawes Sr. and his son . Mr. Dawes aggressively attempts to have Michael invest his tuppence in the bank, snatching it from him . Michael demands it back, causing other customers to misinterpret, and all demand their own money back, causing a bank run . </P> <P> Jane and Michael flee the bank, getting lost in the East End until they run into Bert, now working as a chimney sweep, who escorts them home . The three and Mary Poppins venture onto the rooftops, where they have a song - and - dance number with other chimney sweeps . Then, Mr. Banks returns home, receives a phone call from his employers, and speaks with Bert, who tells him he should spend more time with his children before growing up . Jane and Michael give their father Michael's tuppence in the hope to make amends . </P> <P> Mr. Banks walks through London to the bank, where he is given a humiliating cashiering, and is dismissed . Looking to the tuppence for words, he blurts out "Supercalifragilisticexpialidocious!", tells one of Uncle Albert's jokes, and happily heads home . Dawes mulls over the joke, but finally "gets" it, and floats up into the air, laughing . </P>

What is the chimney sweeps name in mary poppins