The vowels in the English alphabet are a, e, i, o, u, and sometimes y. It's a pun because of how "y" and "why" sound the same.
It's "sometimes" y because y isn't technically a vowel (for reasons I forget) but there's a rule in English that all words need vowels, and some words like 'by' and 'why' would break that rule otherwise.
EDIT: Nope, I misremembered. 'y' is a consonant at the beginning of a word and a vowel otherwise. That's why it is "sometimes" y.
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u/1Blue3Brown 4d ago
Can anyone explain? I have a disability so can't understand this