PI, you forgot a few:

When you're sliding into first,
And you feel a little burst,
Diarrhea! Diarrhea!

When you're sliding into home,
And you feel a little foam,
Diarrhea! Diarrhea!

When you're climbing up a ladder,
And you feel a little splatter,
Diarrhea! Diarrhea!

When you're sliding on a slide,
And you feel something glide,
Diarrhea! Diarrhea!

A template for easy creation of a Diarrhea! Diarrhea! ditty:

When you're (insert activity here)
And you feel a (insert sensation here)
Diarrhea! Diarrhea!

Note: There are many variations of both the template, and the way the rhyming goes, although in almost every version of this "song" the rhyme scheme is: AAB. Feel free to experiment with your own Diarrhea! Diarrhea! songs.