What the fwck?

Remember the vowels you learned in school—"a, e, i, o, u?" Do you also remember the part that followed—"...and sometimes y and w?" ..."W!?" I've seen diphthongs mentioned as examples, such as "chew," but never as a straight-ahead vowel. I found an example—the strange little word, crwth. It has Welsh roots yet is in my (American) English dictionary and is pronounced like "tooth." It's a stringed musical instrument, and here is what it sounds like. By the way, that clip sounds sort of like music played backwards. "Turn me on, dead man," indeed.