“Doctor,” said the woman, “every night my son dreams he's a chicken, and then he starts acting like one. \_20\_, he flaps his arms like wings, puts his head down to the ground, and starts eating bugs. \_21\_, his head goes back and forth when he walks. \_22\_, he even comes into my room and wakes me up at dawn.” “This is very serious,” said the doctor. “You should bring him to me at once. \_23\_, he might develop other strange behaviors, \_24\_ building a nest.” “OK, Doctor,” said the woman. “But I'm going to miss the eggs.”