H20

A nokia rush into his practical session late. Fearing he'll get an "F", he asks a fellow nokia what she's been doing. "We've been observing water under the microscope. We're suppose to write up what we see."

The page of her notebook is filled with little figures resembling circles and ellipses with hair on them.

The panic-stricken nokia hears the bell go off, opens his notebook and writes, "During this laboratory, I examined water under the microscope and I saw twice as many H's as O's."