[Observation] Announces “trick or treat” as he wanders over to the candy dish. [Intentional] yes [Function of Message] Wants Candy. [Means] 
echolalia
s p e e c h + g e s t u r e
b e h a v i o r a l
e c h o l a l i a
c o m m u n i c a t i o n b o o k
s p e e c h r o u t i n e