The family goes to the local YMCA to attend one-time-only free classes. Homer participates in a basketball class, but suffers a torn ACL after a dunk attempt ends with the backboard crashing down on his leg. After Homer gets surgery, he is told by Dr. Hibbert that he cannot go to work and must stay home, where he finds himself extremely bored. One evening, Ned asks Homer to watch Rod and Todd while he attends a Chris Rock concert (that he believes is a Christian rock concert). Rod and Todd enjoy having Homer take care of them, which gives Homer the idea to establish his own day care center.