Lisa feels that her relationship with her father will never be close, and she develops stress-induced stomach pains; Marge inadvertently knocks out Milhouse.
When Homer installs a cell phone tower on his roof to pay for his destruction of the Bill Of Rights, the machinery is put in Lisa's room, forcing her to move in with Bart. When the new living arrangement causes her stress, Homer agrees to try sensory deprivation therapy with her.—Mike