Chemistry is a hard science and not an obvious source of humor for most. There is, however, a lighter side to chemistry; its well-known terminology and theories make for some corny jokes and puns. One example of a joke from Inorganic Ventures' website is, "What did the scientist say when he found 2 isotopes of helium? HeHe." He is the symbol for helium, and "hehe" in written language connotes laughter.
Another corny yet amusing chemistry joke is, "Don't trust atoms. They make up everything." The humor lies in the double meaning of the term "make up." Atoms make up everything, meaning everything in the universe is made up of, or consists of, atoms. Since "make up" can also mean to fabricate, the joke suggests that atoms are not to be trusted because they are known to lie.
Another corny joke is based on the well-known chemical symbol for the element sodium. The joke goes, "Anyone know any jokes about sodium? Na." The joke is that Na is both the symbol for sodium and an informal way to say, "no." A pun based on the element barium from the Inorganic Ventures' website is, "What should you do with a dead chemist? Barium!"