Biggest size discrepancies in fights?

McClellan always looked twice the size of his middleweight opponents. I thought Mugabi--in shape Beast--was a huge 154, especially from the waist up. When he fought Gerald, he looked like a welter fighting a lightheavy or perhaps even a small cruiser. He was twice the size of a big 154 pounder. Incredible. And he certainly looked huge against guys like Bell and some of those other hapless guys he made WBO title defenses against. Man, that guy was a real gunslinger at 160.