Funnypedia

N 2: Joke about teacher, chemistry wordplay
Why did the physics teacher break up with the biology teacher? There was no
chemistry. N 1: Joke about school, chemistry and teacher
Teacher: Donald, what is the chemical formula for water?
Donald: H-I-J-K-L-M-N-O.
Teacher: What are you talking about?
Donald: Yesterday you said it was H to O.