I'm not Stu

Look at Stu's Face!

It's very weird 

just like Tommy's weird Face in Chuckie's Dream! 

At the End of Rugrats Episode called "In the Dreamtime", 

Stu says, "I'm not Stu!" and he began to laugh and then 

Chaz (Chuckie's Father) woke up from his bad Dream by screaming.