HM here. Public servant and union member. And yes, I am aware of the typo in my blog name. http://www.harrangueman.blogspot.com/
I don't find it happens *that* often, but by god it's frustrating when it does!
The same thing happened to me the first time I watched Brokeback Mountain. I checked the ending online the next day and then some time later finally got and sat through the entire movie...to realise dejected that in fact I didn't miss much at all.
My parents hired DVDs only three times before refusing to never do it again - they only ever buy them now!