Here is the list of what makes me bored:

Nothing on TV

Sitting through an entire school day (How obvious was that!)

Sports (I'm not a sporty guy, although basketball's good)

Mr. Magorium's Wonder Emporium (I had to sit through that in the cinema and it SUCKED!)

Waiting for a DVD to come out

When you think something's good but it isn't and you regret wanting to see it ie. a film

What's yours?