The most famous loop af all time. The "Amen Break" is a six-second drum sample from the b-side of the chart-topping single from The Winstons in 1969. This sample was used extensively in early hiphop and sample-based music, and became the basis for drum-and-bass and jungle music.
The following video does an amazing job of "breaking" down just how important this 6 second sample is in the context of music to follow.
On a side note I have bottled up a couple of my personal favorite sampled filled treats.
Hexstatic - Ninja Tune
Aim - Original Stuntmaster