Is learning C really a must for a programmer?

Many have this opinion. Somehow, by doing manual memory management allocation and garbage mangement one would become a better programmer.

I have little experience in C mainly because I can write terser and more readable code in Racket or Haskell. However I'm willing to give C a try just to learn these lessons that everybody keeps talking.

But I have a sneaking suspicion that I already know most of what is there to know. Can you list some useful lessons that a typical high level code dweller would be oblivious of?

>>17
In my home country, this is Kazan of Russia, jewish student
1. control stuff everything
2. bribingto policeman
3. spit to intelligence when talking, soul smell bad
4. have too much money, many jewish student, armani cloths and versace pants, testoni shoes
5. raping? russian girl because russian girl say jewish boy no thanks, very big nose and greasy
6. very smell of falafels eating by jew
7. very smell of colonization, no leaving long time, sometime 1000 years?
jew=devil same