 In a parody of The Twilight Zone episode , " The Little People " , Lisa performs a science experiment to see if cola will dissolve a tooth , and Bart shocks Lisa as part of his project to prove that nerds conduct electricity . The tooth is also shocked ; it undergoes an unusual reaction and creates a race of miniature beings . Lisa discovers this the next day and marvels at how the people in her universe evolve at a rapid rate , going through the various ages humans have gone through into modern times and eventually , a society more advanced than current humanity . Bart destroys some of the ecosystem in Lisa 's tub universe , and the people respond , sending a squadron of space ships to attack Bart , who vows revenge on the small universe as Lisa wonders what to do . Suddenly , she is shrunk and beamed down into the tub , where the citizens explain that they regard her as God , and they want her to do something about Bart , whom they regard as the Devil . She says she can help them if they can <unk> her , but they tell her they have not figured out the technology to do that . This angers Lisa , since they should have had both technologies figured out before shrinking her . At the same time , Bart grabs the tub and submits it in the science fair , and Lisa is forced to watch from within as Bart wins first prize . Realizing that she is now stuck in the small universe forever and having somehow lost her slippers , the very bitter Lisa orders her citizens to grovel and bring her some shoes , with one of the citizens adding that he will get some socks for her , too . 
