You didn't care for the story? When I was growing up, I loved the story. I genuinely thought I was going to get an owl on my 11th birthday.
But I agree - anything that causes you to create in your head, when you see someone else's interpretation it will never be as good. I'm a big fan of the Discworld books, but I think they're practically unfilmable because the characters I have in my head and the world they inhabit would never be able to be recreated in real life. I tried to watch the Sky One adaptations they made and I just couldn't bear it, they seemed terrible to me. That's one edge books have over films; films are someone's vision, books can be your own.
Which Harry Potter film? Probably the first, I never got any others on DVD and I've only seen them once or twice. If you mean which film have I seen the most time in general, I have no idea. I go through phases, when I was about 8 my parents only had like 10 videos, and I watched them all so often. I pretty much knew You've Got Mail word for word.
Nowadays I watch far more films, and consequently a lot fewer times, although I've seen the Fellowship of the Ring a lot.
I seem to recall reading somewhere that semen can range from transparent through white to yellow while still not being an indicator of disease. I don't want to google it to try and find a source though for obvious reasons...