When it comes to knock outs, these two stand out:

The famous standing ktfo!
http://youtube.com/watch?v=lykODy0mKl4

And the uppercut from hell!
http://youtube.com/watch?v=qRtFcKZ8o6A

But complete performance my personal favorite would be these:

Versus the half filipin half australian Makelin, pac relentlessly broke this guys rib all fight long. IMO pac was at his most aggressive in this fight til Scott Makelins corner threw in the towel.
http://youtube.com/watch?v=qMbDoubd9gA&feature=related

The destruction of Ledwaba!
http://youtube.com/watch?v=aVhgiLMukIo

Pac in the undercard of lewis tyson, he made quick work of julio.
http://youtube.com/watch?v=HiUGEVTlSyM&feature=related

Versus Mabman, Pac was just too much.
http://youtube.com/watch?v=i_2ooXdcxLQ&feature=related

And Ofcourse ending the third in three!
http://youtube.com/watch?v=YT4KeEIfQpA&feature=related