http://revach.net/article.php?id=1584

Section: Parshas HaShavua   Category: Quick Vort
Parshas Shemos: Chasam Sofer - Bnei Yisroel Will Once Again Stand Proud Once Grabbed By the Tail

Moshe Rabbeinu was not a magician performing an entertaining magic show for Paroh. Each of the Mofsim that he performed were deep messages Hashem was sending to Paroh. The Chasam Sofer says that the first Mofes was to put into proper perspective the Bnei Yisroel's plight and Paroh's dominance over them.

Moshe Rabbeinu's "Mateh" (his rod) was a symbol of Bnei Yisroel's greatness. They were the proud rod of Hashem's glory in this world, "Mateh Oz Tiferes Hashem". Moshe was commanded to throw them down onto the floor. They were a  great people that were thrown down and trampled under Paroh's feet like the low snake.

In the merit of their humiliation and their torment they will be redeemed. This is symbolized by Moshe grabbing the "tail" of the snake as opposed to the "head". When he grabbed the humble tail they once again became of proud "rod".