Lord of the Rings, any of them. That said, for me the best kind of films to stumble across are the ones that require absolutely minimal cerebral effort. One of the later Harry Potters for example. Or Vertical Limit, or almost any trash that isn't a romcom or one of those ghastly late 90's "coming of age" movies set in American High Schools.
You forget how good the LOTR movies were. Just settling down with junior to watch the two towers battle scene now.
The Dirty Dozen The Great Escape
Any On the Buses film
Ghost Any spagheti Western True Grit (The original) Young Guns 1&2
We share a few similar film tastes my scouse friend. Although noticing you pointing out it's the original True Grit you're referring to, I'd like to point out that the remake is also brilliant in it's own right.
I realise you might not be disputing that and it's just that the original is one you always watch to the end.
To be fair, I'm finding it hard now to distinguish my favourites from ones that should feature on this thread!
Reading through this thread jogs my memory. Con Air and Double Jeapardy are two that I have came across randomly when they've been on tv. Bird on a Wire is another good one I saw recently having never heard of it.