I would happily pay to let someone else go to see "Angels & Demons" in my place. If it only turns out to be half the pile of complete & utter horse s*** that the previous offering was it is still gonna stink the cinema out. I've heard that Ewan McGregor's accent alone is worth a full refund. 
And much as I like Tarantino I'm not holding out much hope for "Inglourious Basterds" either.
As for Ben Stiller .... (holding nose) peee-yeeeeeeeeeeeew!

Saw Angels and Demons last week (I get most of my cinema viewing done close-season!!!), I described it to someone as "24 with God". Hanks is irritating, the female lead is pointless, Anti-Matter is just a rubbish hook to provide a big explosion, and McGregor actually is the best point of the film (accent aside - it might be South African, Scottish, New Zealander, Canadian... anything other than the Ulster accent it was supposed to be).
It was miles better than Da Vinci Code which was nonsense from the beginning to the end. This was nonsense, but more entertaining nonsense.
I will, of course, accept a payment retrospectively.