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What are the classic jokes in chemistry?

1. The first accident in my life seems to be no accident today.

4th floor, Experimental Building, North Huada District.

One of the two goods in our class was equipped with diazonium solution (for analysis, test and titration, and the other two goods were equipped with 50 liters for the whole class), and then somehow, the bottle burst.

Diazo splashed all over our faces and arms.

The trouble with diazonium solution is that it can't be washed off when splashed on the skin, and it is yellow.