Synergy: Greatest Moments (http://www.youtube.com/watch?v=NXVmH2IruXA#)
Synergy is a HL2 mod that can be found here:
http://store.steampowered.com/app/17520/?snr=1_4_4__13 (http://store.steampowered.com/app/17520/?snr=1_4_4__13)
It's really, really, really fun to mess around and do the hl2 campaign. We should all play it tonight or something.