Mine:
In 'the Glow Pt.2' by the Microphones when the stereo panning pianos and acoustic guitars drop out of the mix while an organ drone gently seeps into the feedback and Phil starts to sing 'I could not get through…'

The first track on Vision Creation Newsun when about 2 minutes in when the ambient sounds drop out leaving just hissing tape noise which varies in speed until the drums and chanting kick in.

The chord change about two/three minutes into Banshee Beat by Animal Collective.

In 'I See a Darkness' when Will sings 'Did you know how much I love you?'

In 'What I Say' by Miles Davis when, after five minutes of repetitive funk basslines, relentless drums and Keith Jaretts incredible fender Rhodes soloing, Miles begins his solo with an ear piecing screech the likes of Jazz had rarely seen before.

Probably more, I can't remember them though.