"Has anybody ever SEEN G-d? Noooo."
"Has anybody ever HEARD G-d? Noooo."
"Has anybody ever FELT G-d? Noooo."
"If you can't see, hear or feel Him then he must not exist."
Little Mendel was sitting in class and had never felt so attacked before. Everybody knew that he was Jewish and waited for his reply but he was speechless.
Then Little Mendel stood up on a chair and said "Has anybody here every SEEN the teacher's brain? Nooooo. Has anyone ever HEARD the teacher's brain? Noooo. Has anyone ever FELT the teacher's brain? Noooo. If you can't see, hear or feels the teacher's brain then he must not have one."