Anne-Hath was originally given the lead in "Knocked Up" but pulled out when she discovered Judd Apatow intended to use footage of an actual child birth in the scene where her character has a baby. Katherine Heigl had no qualms about it and ended up securing her career-making role.
Tom Hanks there is only one Forrest Gump !
...These movies I have to watch at least, 4x or more a year