When I'm bored I'll whip out a DVD and have a look at some of the extras and give them a chance. If it doens't seem intersting in the first minute/whatever I'll stop it.
As for commentary tracks...it depends. Some commentary tracks are really interesting and entertaining (I loved the 'Chopper' commentary done by the man himself - that was great), but some are excruciatingly boring (British DVD of Romero's Dawn Of The Dead featuring Tom Savini and some other guy talking on such rivetting topics as being out of cigarettes and being desperate to use the toilet...I can't believe I actually sat through the entire thing!)
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