I wrote a utility for OS X to send Wake on LAN packets (WakeOnMac) quite a while ago. I know that info isn't any help for classic Macs, but I can confirm that my code does exactly what's described in this thread (send a broadcast UDP packet with those contents on any port), and it has plenty of success stories spread throughout forums on the internet

Heh. Back in the dial up days, you could send an modem ATDT hangup command over MacPing and cause the target machine to freeze. I hated it.

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That reminds me of my dialup days back when I was into IRC. The lucky bastards who had broadband at the time could do some kind of a CTCP PING or something (it's been a while, can't remember exactly what it was) involving the string "+++" which promptly caused my modem to drop its connection. Those were the days...

Don't even get me started on the evil crap I did to classmates in the computer lab in middle school using AppleScript and (I think) program linking...(oh man, those were my stupid years)