Three favorites from Kenneth Tynan:

On absurdism, 1962:

The man who reacts to the universe with a cry of impotent anguish is acceptable as an artist only if he can persuade us that he has sanely considered the other possible reactions and found them inadequate.

On Ionesco, 1960:

When you've seen all of Ionesco's plays, I felt at the end, you've seen one of them. For a professed enemy of didacticism, he is strangely didactic himself.

On the ass, 1966:

The buttocks are the most aesthetically pleasing part of the body because they are non-functional. Although they conceal an essential orifice, these pointless globes are as near as the human form can ever come to abstract art.