JOke of Plastic

 Student : Sir! Sir!........... there was an elephant near my house.....................and i left one dozen bananas near him but when i came back  i noticed that the elephant ate all the bananas except one ..............Can U say Y?    

Teacher : I think because, that elephant was full due to those 11 bananas so he couldn't finish the remaining banana!!

Student : No sir , that's not it!

Sir : Then wht's the reason?

Student : It was because that remaining banana was made of PLASTIC!!

                  Intermisson

Student (Again) : I again left one dozzen bananas near my neighbour's house yesterday. There was also an elephant there. But when i returned, i again noticed that the elephant i saw hadn't even touched those bananas. Can u tell me the reason?

Teacher (Immediately) : erm.. is it because all those bananas were made of PLASTIC?

student : No sir! That's not it

Teacher : Then what is the real reason??

Student : Because now all those Bananas were real, but that elephant was made of PLASTIC!