Spy from Anonymous?
The simplest DDOS I can come up for about your home server is pressing the power button. A DOS is not a specific attack, it is the end result of an attack (namely a denial of service). A syn flood is simply a means to an end.
For instance, if you exploited your server, got root access, and gave the shutdown command, that would be a very effective DDOS.
Other things would be ARP poisoning on the home network, and perhaps just saturating the thing with file transfers.