About ten minutes the episode where Timmy wishes for a different voice to get a role in a musical with Trixie and ends up switching voices with Chip Skylark, he decides to "ask television" what he should do next. There is a gameshow similar to "Wheen of Fortune" on TV, and one of the players is giving his final guess.
The puzzle reads something like:
"Get Chip Skylark to give T_mmy Turner's voice back."
The player incorrectly guesses "... Timmy Turner's voice back," which would not be a possible answer anyway because there are already i's on the board. The correct anwser is "... Tommy turner's voice back." However, this is not a possible answer either because there are already o's on the board, too.