The Little Lulu Show
Jr. Detective Tubby (1x8)
:
"Jr. Detective Tubby"
Lulu discovers a message that appears all over town written in black crayon: ""Lulu Loves Tubby"". When she points this out to Tubby, he becomes Tubby the Detective to search the whole town to see who has a black crayon. After Lulu gives up, Tubby admits he's the culpret.