LOL! I love it. Great donkey!
Halloween? I don't celebrate it only because, sadly, where I live there are no kids and none come around. I loved it as a kid and even as a Christian teen. There was no way me or any of my friends that I knew of ever took it seriously as worshiping Satan, demons, or anything like that. We were just having good clean fun is all. And no, we didn't pull any dirty tricks on anyone, we did have Christian values after all!
But taking it seriously? No I wouldn't do that. Like others said, it's all about the candy!
I celebrate Christmas with a tree and Santa Clause as well, but I don't take them seriously or believe in them either. It's just good fun.
I know one Christian, a pastor, who is strict about not celebrating any of these things, and can back it up with scripture (albeit a lot of scripture taken out of context and massaged to fit his particular view). He also won't call anyone a friend that doesn't agree with his particular version of Christianity. He gets really offended at even the slightest hint that he may be a little legalistic. And his church? Well, many times his services are attended by he and his wife only. I don't think it's really a good thing to become so heavenly minded that you are no earthly good!