I worry that people who say "I'll sleep when I'm dead" may have missed a Science class or two.

What does the chemistry teacher like to do with his dead bodies after he kills 'em? Barium.

Why did the computer scientist die in the shower? The bottle of shampoo said, ""Lather, Rinse, Repeat.""

I'd made a chemistry joke... ...but all the moderately amusing ones have used to death.