Re: what ride would you like to see be overlayed for halloween
At first I thought Splash Mountain would be a great candidate since it's close to Haunted Mansion anyway they both can have Halloween influences but after thinking about it, people want to go on that ride to hear the music and see the cool AAs, not worry about being spooked especially since that attraction is meant for the younger folks.
I could see Matterhorn being a great example of an overlay, even with effects that cast over the mountain at night, such as a Jack-O-Lantern face it would be really simple and exciting.
"Up" is a relative concept. It has no intrinsic value.