I rarely have an actual WTF moment. I usually space out and as such don't really care.
Hmm, but to pick a point... I'd say I was watching the forgotten I had DVR'ed, so I watch it till it has maybe five minutes left... We're near the end... Oh yeah, I can feel the credits coming... Suddenly it stops, it stops right at the defining moment, I have no idea what happens next... No idea whatsoever. All because my DVR is Dish and Dish is controlled by the freaking mentally defective, the whole lot of them. They're not mentally handicapped, these people are downright Cro-Magnon...
Plus, I've missed very important episodes all because they got the TV guide wrong and my DVR schedule decides to completely ignore the episode in question because apparently - as the guide states - it's a canceled show that hasn't been on in a year. That's right, a year. So basically Dish Network is my WTF moment for life.