I have been wanting to make this video for such a long time, but I've also been making a bunch of excuses. Finally, I couldn't take it any longer and had to record it (now that I bought Camtasia, I have a lot of motivation to get off my butt and record things).
Quick synopsis/spoiler: There are not only 5 vowels in English. There are 15 vowels. Whenever I say this, I typically get this reaction (pictured at right):
"THERE ARE FIVE VOWELS, A, E, I, O, U. 1, 2, 3, 4, 5! OH, AND Y, SOMETIMES Y. THAT'S SIX. KIND OF."
Actually, it's more like this: