Meryl Streep as Donna Sheridan-Carmichael in Mamma Mia (2008) | Mamma Mia! is an absolute triumph of a movie. It is not just one of Meryl Streep’s funnest and most successful films, but it is also a celebration of modern femininity. The musical defies outdated ideas regarding women’s sexuality and traditional family life, and it lauds the value of female friendship. These progressive ideas are then paradoxically combined with the innate nostalgia of ABBA’s glorious repertoire. If anything, this staircase scene captures the freedom and fun of the entire picture.