Nothing gets you in good mood quite like knocking someone out. At least, that's the case if you're a professional mixed martial arts (MMA) fighter.
Just ask Vitor Belfort, who told Fox Sports he was the "happiest man in the world" after he put a stamp on his trilogy with Dan Henderson by knocking out "Hendo" in the very first round at UFC Fight Night 77 in Sao Paulo, Brazil (see it again here).
Of course, the win was extra special for "The Phenom," as he revealed he and his family had to sacrifice plenty in the leadup to the bout.