How can chemistry class attract students' attention? Are there any jokes about chemistry?

Our chemistry teacher succeeded in attracting the attention of all the students: talking about sulfuric acid once.

When hydrochloric acid

The teacher brought two bottles of reagent, and first told us the nature of the bottle on the left, which is sulfuric acid; What about the bottle on the right? It's hydrochloric acid. The point comes, and then he holds the bottle on the left in his left hand, the bottle on the right in his right hand, and then puts his hand under the lecture table. Later, he crossed his hands and asked the students to tell if a bottle was sulfuric acid. The students were stunned first, and then laughed collectively. .........

Since then, the teacher is very popular, but no one thinks he is stupid! ! ! Everyone just thinks he is kind and humorous! ! ! ! !

Are you satisfied with my answer ~ ~