One year the talmidim of R' Nachum made a Purim tisch. A bochur decided to make a joke and said it says in the parsha
ויהי בשלח פרעה את העם - ולא נחם
R' Nachum on the spot answered
דרך ארץ - פלשתים
The continuation goes like this:
In פרק במה מדליקין it says: ולא בחלב נחום - you are not allowed to use Nachum's oil/wax for Shabbos lights.
Why again are we discriminating against poor Nachum?
The answer is: Nachum had a candle factory in Mitzrayim and did not want to leave since he was doing good business selling all the candles for מכת בכורות.
Since he did not leave with כלל ישראל he was punished that we can not use his candles for Shabbos lights.....
Hope you get it.....