How we met the dark side of one of Hollywood's most likeable TV stars, Neil Patrick Harris, is a pretty short story: Less than 140 characters, in fact.

After soap opera star Eric Braeden ('The Young and the Restless') canceled his returning guest appearance on 'How I Met Your Mother' on short notice, Harris took to Twitter on Friday to blast the 69-year-old TV veteran with this blunt message: "Eric Braeden is a D-Bag. The actor, (Robin's dad) agreed to a cameo, then last night bailed, saying the part wasn't 'substantial' enough."

NPH soon added that Braeden was replaced with "fantastic" Ray Wise, and tweeted welcoming words to Wise about the cast change.

A few hours later, Harris tweeted his regrets ("Now I feel bad for the D-bag comment. Don't know the guy personally. I'm just fiercely protective of our show."), but the damage had been done.

When contacted for a response to Harris' slam, Braeden didn't hesitate to tell his side of the story.