After the tenth plague, the slaying of all the Egyptian first born, Pharaoh told Moses the Jews were free to leave Egypt.
So the Jews packed their carts with their belongings and tried to leave. The problem was, with all the dead Egyptians, the funeral homes could not handle the demand. The end result was streets littered with coffins. With the streets impassable, the Jews couldn't get there carts out of
They complained to Moses. "We can't get out of Egypt unless you do something about these blocked streets".
Moses in turn, called out to God. "Lord, please do something about this coffin problem." Understand with all the commotion it was hard for God to hear what Moses was saying.
He thought Moses said 'Coughin" and responded by turning all the wine into cough syrup. And that is why, to this day, we drink Passover wine that resembles cough syrup.