Toho Studios, Godzilla copyright owner, is apparently suing Subway because of this ad.
Subway Five Dollar Footlong Monster
Undoubtedly this makes a reference to Godzilla (giant reptile, Japanese city under attack), but this looks even less like Godzilla than GINO from the 1998 US Godzilla.
But, on the other hand, here’s an ad that didn’t cause Toho to sue:
I can’t get that Pepto diddy out of my head now!!Aaaargh!!It’s beat is so catchy!!