In The Closet and Give in to Me. In The Closet is very fun, and my best friend, a fellow fan, loves the song and video. Because it's fun, heh. I love Give in to Me as well, not as much as Dirty Diana but it's close.
The whole album is a masterpiece. Though, I have always been very drawn to Why You Wanna Trip on Me. I also adore In the Closet, and would love to have known just how this song would have evolved had the MJ/Madonna collaboration actually gone ahead.
Give In To Me (hence my username) is my favorite from Dangerous. I like it because the song, and video are raw and classic Michael. It's one of those songs that makes the hairs on the back of my neck stand up when it's playing.