Kenan & Kel, but it's every single time the word 'why' or the letter Y is present in the dialogue.

Uhh, yes, I'm just that much of an insane guy to have this video exist to begin with. You could say it's my contribution to the 25th anniversary of the show - skimming through all 65 episodes of the show, as with Two Heads Are Better Than None to identify every single time the word or letter is said throughout the show.
Whether it'd be in a scream of pure annoyance or anger, or even the swiftest mutter, regardless of the conversation context, you could literally say it's the ULTIMATE compilation (possibly missing a few, which wouldn't shock me).
Quality wise, some episodes are in lower resolution, due to how I wanted to acquire, I guess TV bug-less captures (only noticable for three episodes for Series 1), considering most sources are from UK airings, hence it doesn't look entirely consistent with the iTunes rips for 99% of the episodes prevelant.
By the by, the letter 'Y' is only said ONCE on its own throughout the video. Where it is? Try and figure it out yourself, I dare you, haha.
Lastly, this will most likely be blocked or removed in the future, heck, I'd be shocked if this even goes public anyhow.

©Viacom