Gimme More has always freaked me out, especially the acapella.
The "hear me out" part, the backwards "oooh" that sounds like a satanic chant, the demonic laughter at the end (what would be the beginning of the normal song).
2:24-2:30
I'm ashamed of my life
I'm ashamed of my life
My **** so crazy
I came to post this. It kills me every time I hear it.