For reasons even I am not quite certain of, I have created a new CPU cycle
waster, Skwonk! 1.0.
Skwonk is an application that will listen to your Ethernet interface for
traffic. All traffic. Like a traffic monitor. Difference is, Skwonk plays
specific sounds for the type of packets that go flying by. For example, if a
TCP packet for port 80 goes flying by the network to another Mac, Skwonk can
blurt out a belch, or hoot like an owl, etc.
You can get more info from here:
And the Direct Download is here: (Remember, Mac OS X ONLY)