Forgive me if someone else mentioned this sometime before I got here (not to mention that I introduced a Yu-Gi-Oh reference to this forum), but I found this kind of interesting...while flipping through the channels some time back I happened upon an episode of the "Yu-Gi-Oh" cartoon: I didn't plan to stay more than a few moments, but I stopped myself as I heard one of the characters announce that he was using a card/creature thingy that he called "Gradius Fighter." Aside from the fact that he pronounced it "Gray-dee-us," I wondered if it could be what I thought it was...sure enough, when he played the card a familiar-looking two-pronged spaceship appeared on the playing field. A minute later he used another card called "Gradius Option," which allowed him to create another ship just like the first one, with all its weapons.
I Googled around looking for an episode screenshot, but was even more surprised to find that apparently both cards are actually available in the real-life Yu-Gi-Oh game:

Apparently there's also a "cyclone laser" enhancement that can be added to the Gradius ship (this card's apparently in German though):
I guess that since Konami makes a bunch of the Yu-Gi-Oh video games they're free to inject their own stuff into it if they please....I just wondered if anyone else had seen this, since it wasn't mentioned in the "Guest Starring" section of the Gradius Base, or anywhere else I could find offhand.