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You need to realize that this is not a smart comedy. It is silly and some impossible things happen. When you are going to see this film prepare yourself for that and you will enjoy it. It is impossible for anyone to change into a credible fat lady in less than an hour, much less in a few minutes. But you need to let that kind of stuff go so the comedy in it gets to you. The father of the kids just looks amazed at the things the nanny can do but does not try to help her. Again, don't try to make sense of it. There is a scene where I was about to wet my pants because I could not stop laughing, that is when Big Momma dresses up as Bo Derek in that famous scene in 10. I liked it and so can you.
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