Here is the short version of the *Evil I story,* that I thought up to teach elementary children whether to use *s* or *ies* to form the plural when a singular noun ends in **y.**
Poor *Y* is the most exhausted and overworked in the alphabet, because he has to be both a vowel and a consonant. He is a vowel in words like dye and lady, and usually says *i* [long i sound] or *e* [long e sound.] Sometimes he is a consonant in words like yak and yellow. [Cue more examples of each at the chalkboard. Somewhere at this point also I'd usually let the kids walk around slowly a bit, all slumped over, pretending to be tired *Y*'s.]
The nasty/bad/evil **i** wants to take Y's job away from him when he is unprotected at the end of a word. *Evil i* is helped by his terrible henchmen e and s. [Cue examples at board - baby to babies etc.]
However, the vowels are the good guys of the alphabet, the *bodyguards.* When *Y* is at the end of a word and has a vowel bodyguard beside him, he is safe and protected. The word can be plural with just an *s*. [Cue examples at board - day to days, donkey to donkeys etc.]
It was always noted that the henchman "e" of "ies" did have a good twin who was stronger and was a bodyguard.