From The Catcher in the Rye, by J.D. Salinger
Then, after the Rockettes, a guy came out in a tuxedo and roller-skates on, and started skating under a bunch of little tables, and telling jokes while he did it. He was a very good skater and all, but I couldn't enjoy it much because I kept picturing him _practising_ to be a guy that roller-skates on the stage. It seemed so stupid. -- J.D. Salinger, _The Catcher in the Rye_, p. 143