What makes us do it?

I already have this movie on DVD.  Plus I've seen it so many times, I know some of the lines by heart.  So why did I sit in my living room last night and watch this stupid movie with commercials on cable, instead of shutting it off and watching the commercial-free disc instead?

I have a couple of friends who do the same thing.  A movie comes on TV that they already own and have seen countless times.  But they'll sit there and watch it again.

Can movies be like comfort food?