The fighting pride of the Philippines was one of the best power punchers of his generation. He knocked out Marco Antonio Barrera to rise to stardom. Beaten Erik Morales twice via knockout. Pacman had close fights with Juan Manuel Marquez. Of course winning against bigger opponents like Oscar Dela Hoya, Miguel Cotto, and Antonio Margarito.
The video below was a lady having practice with a guy. Supposedly you will not hit your trainer. But accidentally he was hit badly and knockout for a second.