On the night of Rosh Hashanna, there is a custom to eat various foods whose names sound like something associated with Rosh Hashanah. These names can be in one language, and they make a blessing in Hebrew using a Hebrew word that sounds like the word in the other language.
For example, I have heard that some people eat livers because the Yiddish word is leiberlach and this sounds like lev - meaning "heart". They make a blessing that G-d should give us a "good heart" (i.e. - we should be sensitive and not stubborn so we can do mitzvoth.)
Can one, therefore, make up their own signs based on this schema? For example, can one drink Schaefer beer on Rosh Hashannah, because the word "Schaeffer" sounds like "shofar"?