Kevin and Winnie’s high school friend, Alice Pedermeir, was known for her annoying voice, but the part didn't originally call for one.

At her audition, Sloane says, “I made the choice to be whiny, and be a version of myself if I were mad. It was the first time in an audition that I was confused, because I wasn’t trying to be funny, but what was happening was funny. I started to realize that the crazier I am, the funnier it is to people.”

http://tvline.com/gallery/memories-from-the-set-lindsay-sloane/#!1/sloane-wonder-years/