If you have never read Daniil Kharms, read him. Absurdism at its best, and so ridiculously funny, you won't know what hit you. He is one of the undiscovered Russian masters with the tragic tale of being repressed most of his short life and having starved in prison to death.
I'm rereading his collection of poems and short stories in Russian now, and I marvel at his genius. Here is a list of his works.