This imaginary conversation popped into my head earlier today and I thought it wouldn't be out of place in a Ryan George sketch, specifically the English Spelling one

"Every word has to have a vowel, and the only letters that can be used as vowels are a, e, i, o, and u."

"But what about why?"

"No, y can't be a vowel."

"No, I mean like the word why; it doesn't have a, e, i, o, or u in it."

"Oh... Well I guess y can be a vowel then. But only sometimes!"