In connectbot (ssh client) if you're connected to a remote server, and type
reboot, it will reboot both the remote server and the local phone.

The initial bug report is here:
http://code.google.com/p/connectbot/issues/detail?id=64

In attempting to recreate this, I tried going through several intermediary
machines, and the gphone would still reboot after issuing the command on
the server, which would appear to remove the possibility of it being a
tcp/ip implementation bug.