Alyson Hannigan's character on Buffy the Vampire Slayer (1997), Willow Rosenberg, once mentioned that she wrote Doogie Howser, M.D. (1989) fan-fiction as a girl.
Hannigan went on to star in "How I Met Your Mother" with Neil Patrick Harris, who as a boy played Doogie Howser.
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Things You Didn't Know About HIMYM
FanfictionHere are some mind-blowing facts that you probably didn't know about the show How I Met Your Mother.
