DB Multiverse

Yes, I actually draw this strip in November.

If you didn't have the chance to see the original Americain dub of DBZ, you wonder what the reference is.
Vegeta suddenly yells this number (wrong one by the way, it's 8000 in fact), see for yourself:
http://fr.youtube.com/results?search_query=over+nine+thousand

Note: still today, most of DBZ readers are Japanese :)