I will report on two complementary samples of the most massive galaxies in the Universe. One sample has the largest reported velocity dispersions in the Sloan Digital Sky Survey. The objects in this sample potentially harbor the most massive black holes in the Universe. The other is a sample of what are traditionally thought to be the most massive galaxies: brightest cluster galaxies. These are, in fact, rather different types of objects. The objects with the largest velocity dispersions tend to have smaller than expected sizes---they are the densest early-type galaxies. In contrast, the BCGs tend to have larger than expected sizes. Both these samples appear to be slightly more homogeneous than the bulk of the early-type galaxy population. I will discuss the implications for models of how these objects formed.