ok I found these really bad videos that this guy made using HL1 that are pretty funny. he does all the voices so it sounds funny. just watch...
part 1:
http://video.google.com/videoplay?docid=6326578973788908298&q=black+mesa
part 2:
http://video.google.com/videoplay?docid=-2232930996089415124&q=black+mesa
and heres the HL2, A day at city 17:
http://video.google.com/videoplay?docid=8229646386075345642&q=black+mesa
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yes there terrible but they gave me a chickled or two
part 1:
http://video.google.com/videoplay?docid=6326578973788908298&q=black+mesa
part 2:
http://video.google.com/videoplay?docid=-2232930996089415124&q=black+mesa
and heres the HL2, A day at city 17:
http://video.google.com/videoplay?docid=8229646386075345642&q=black+mesa
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yes there terrible but they gave me a chickled or two