Last bit of beer out of a keg

[truebe]

The last bit of beer out of the keg always has a bunch of sediment that suddenly makes the beer super cloudy. I'm assuming it's yeast that refuses to settle because that's what it tastes like. But the interesting thing about it is that it forms probably the strongest head I've ever seen. You can sit it on the counter for hours and it won't collapse. What causes that? Are there proteins that tend to concentrate the very top layer of beer in the keg, or what's Up?

 

[Rockn_M]

It's all the proteins and yeast that fall out of suspension over the days, weeks during the kegs life.