I have three thoeries on why Spongebob's voice became high-pitched:
1.) The Effects of Aging: As Tom Kenny (voice of Spongebob) gets older, his voice becomes slightly different.
2.) Tom Wanted to Make Spongebob More Child Oriented: Tom decides to adjust Spongbob's voice to try to attract more younger kids.
3.) Tom's Getting Tired of Spongebob: Spongebob Squarepants has gone on long enough and Tom decides to make the yellow guy's voice more higher-pitched to try to nail the coffin for Spongebob.
Which thoery do you think is the most accurate?