英語で小噺 English Rakugo Short Stories by 鹿鳴家 英楽（Kanariya Eiraku)
A teacher is talking with a student.
T: Ken, what is the chemical formula for water?
K: It's HIJKLMNO.
There can't be such a formula.
K: But, you said so yesterday.
T: Did I?
K: Yes, yesterday, you said the formula for water is H to O (H2O).