Part of my Half-Life Fact Files series: http://www.youtube.com/playlist?list=...
This is a video demonstration of a largely undocumented piece of AI behavior in Half-Life. In the iconic freezer room of the game's Office Complex chapter, it is possible to feed the Bullsquids there using the many hanging slabs of beef. After eating, a Bullsquid will become full and refrain from snacking on anything else for a short while, so you can only feed one every so often. Valve fully intended this to be a viable method of distracting the foes in the area as it's even mentioned in the original official strategy guide.
Credit to Barnz for informing me of this trick.