For those of you who haven't heard of The Whistler's Mother, she's a hideous old bat who sits in a chair wearing a cap. Whstler himself painted his mum one day when one of his models was in bed with the flu. It is the most famous painting in America and costs a lot of money (millions and gazillions of pounds).
Mr. Bean goes to stay with his new best friend David Langley who is the curator of the Grierson Gallery in Los Angeles. Everyone in America is very nice to Mr. Bean and treats him like royalty (they think he is Dr. Bean). He tries to tell them that all he does is sit in the corner of the art gallery looking at the paintings, making sure nobody touches them but no-one is prepared to believe him.
David takes Mr. Bean to an amusement park where they go on the ride of doom. More like the ride of boredom. He gets in trouble with the police when he tries to make it go faster and everyone else around him goes flying.
Then he gets David into more trouble with his wife and family and the people in suits at The Gallery when by mistake he sneezes all over the painting and makes the paint run.
Watch him in the film as he does a spot of doctoring in a hospital and accidently drop an M & M sweetie into the open wound of a nice policeman as he is sitting on the operating table.
Then he has to make a very long speech about Whistler's Mother at the unveiling ceremony in front of lots of cameras and men from the army (one of whom looks like Burt Reynolds).