Game of Thrones season 4

They already kind of are doing with the Missandei/Grey Worm romance bullshit.
Then again, some of the filler they are adding is actually quite beneficial, like the Crastor's Keep storyline with Bran and Jon, which was pretty interesting. I hope they continue to give Bran more filler stuff.

They might even show what's happening to Rickon and Osha.

Maybe i just don't know what fillers are (in more ways than one).

http://www.urbandictionary.com/define.php?term=filler

"It is a common misconception that "fillers" are only used to refer to entire non-canonical episodes." I suppose that applies to me. Didn't occur to me that filler can occur in tandem with content that is relevant to the actual story, as well as the fact that i couldn't recognize whether bits of filler is actually relevant because i didn't read the books. Wouldn't the bit involving the white walkers that we haven't seen in the books technically be filler though? Because we haven't seen that (yet) in the books?

Still, i don't think the producers are stupid enough to make entire filler episodes given the risk involved in doing so.