Here Comes the Bride

Here comes the bride
all fate and wide
here comes the groom
thin as a broom

Other additions include:

see how she wobbles
from side to side

And

Here's comes the usher,
the old toilet flusher

When this hit my first grade class, we outdid each other trying to make up new verses, such as "Here comes the parson / his name's Johnny Carson," which I've gotta say was pretty good. Then there was "Here comes the loop / an old piece of poop." This absolutely slayed us, and was probably the reason I spent a few years thinking there was some functionary at weddings known as "the loop."

The parody has been going around since at least the 1960s, and appeared in one of Beverly Cleary's "Ramona" books.