The first three panels build up the alliance to be that of two superheroes combining forces to achieve great feats with their powers, which is what Magneto is expecting. In the fourth panel, we see that Galactus is only using Magneto as a refrigerator magnet. Calling him the “Herald of Galactus” is a bit funny too, since ‘herald’ means “an official messenger bringing news”, which is exactly what he’s doing on the fridge.
As far as I recall, Moe’s lines always appear in this format. To me, it conveys that Moe is more simple/brutish than those around him that use the standard format of the strip.
Five weeks later, I remain faithful