A reddit user by the name of "joe_sadistic" found this in a sample pack used in Half-Life 2. Just reupping here for people that didn't get to see that thread.

Original thread: https://www.reddit.com/r/deadmau5/comments/3szow5/failbait_intro_sample_unearthed/

Mediafire: https://www.mediafire.com/?vc9k7giyzt3u72z

Failbait Intro Sample [MEDIAFIRE LINK]

I AM NOT JOEL ZIMMERMAN. 

This page is dedicated to deadmau5 stems, acapellas, and instrumentals. All stems are completely remade by me unless otherwise noted. 

Hi r/deadmau5!

Failbait Intro Sample [MEDIAFIRE LINK]

mau5stems