-Who's there?
-Stomach
-Stomach who?
-Stomach ask you an embarrassing question... but that might take a while.
-Knock Knock
-Who's there?
-Liver
-Liver who?
-Liver alone! I feel great.
-Knock Knock
-Who's there?
-Kidney
-Kidney who?
-Kidney come from? I was born this way.