Hideki Matsui's nickname in Japan was Godzilla and he actually had a cameo in the movie Godzilla Against Mechagodzilla which was released in 2002. I just discovered that this film was available on YouTube.
The sequence that he's in starts at 0:36:41 and only lasts for about 30 seconds. It looks like he's doing a clinic with a bunch of kids at a ballpark near where Godzilla is coming ashore. When he hears the evacuation commands, he calls the kids off the field. One of the kids pitches a ball before running in, so Matsui swings and hits it a long way. He and the kids watch the military fly in Mechagodzilla, then he herds the kids out to safety.
I grabbed a couple screen shots just for fun:
I'm guessing that that's not a home run that's going to show up in the Matsui home run cards.