Y is for Yiddish wit, for example:
You can't make a shtreimel out of a pig's tail.
- Fun a khazer-shventsl ken men keyn shtrayml nit makhn.
- English equivalent: You can't make a silk purse from a sow's ear.
- Meaning: You cannot produce anything of good quality from poor raw material; often used of people.
In case you've never seen a shtreimel, it's that fur hat on the right.
Worn by certain ultra-orthodox Jewish men on holidays and Shabbat.
(Linking to ABC Wednesday.)
UPDATE: Please see added interesting information in the comments.