I only know 25 letters of the alphabet.
I don't know y.
I don't know y.
'I don't know why' = 'I don't know y' — y is both the missing letter AND the question of why they don't know it. The missing letter explains its own absence. Y is the letter they don't know, and also the unanswerable mystery of why they don't.
Deliver 'I don't know y' with genuine puzzlement — it should sound like you've truly considered this and remain at a loss for both the letter and the reason.
Perfect for:
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Next joke →I asked my wife to let me know next time she has an orgasm.
I only know 25 letters of the alphabet.
I don't know Y.
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