User blog comment:Strife237/Metal Gear Sonic 22/@comment-477304-20140611151446/@comment-26113388-20140611152510

Time to get scientific! Endorphins are natural chemicals found in the human body released when the body is under recovery from exercise or pain. Endorphins are "feel good" chemicals which normally put a person in a happy, cheerful mood.

So....maybe Big's full of endorphins?