The Deadly Drink Order

This is a classic pun. H2O is the chemical formula for water. The second scientist asks for "H2O, too", which sounds like H2O2, which is hydrogen peroxide, a poisonous substance.

• Scientist
• Bar
• Water
• Glass
• Science
• Poison

• What do you do with a dead scientist? You barium.
• A man walks into a bar and says to the bartender, "What, no soap?" Then he dies and she marries the barber.
• One day, a chemistry teacher asked his student, whose name is Raj, "What is the chemical formula of water?" The Raj replied, "HIJKLMNO." The teacher asked, "What is this rubbish?" The Raj replied, "Yesterday, you taught the chemical formula of water is H2O."
• What is the same between water and dark jokes? Not everyone gets it!