"When all my friends in high school, my girlfriends, were going out to bars and picking up men and fooling around on the beach," she says, "I would get Diet Coke and I was the designated driver. So it was never like a priority for me. I never thought about it."
Rosie O'Donnell was born in 1962, and graduated from high school in 1980. Not only did the concept of a "designated driver" not come into use until the mid-80s (MADD was only first founded in 1980), but Diet Coke wasn't even invented until 1982! So, her cutesy story doesn't pass the smell test.