He laughs best whose laugh lasts.

Cleaning anything involves making something else dirty, but anything can get dirty without something else getting clean.

A philosopher is a blind man in a dark room looking for a black cat that isn't there. A theologian is the man who finds it.

If at first you don't succeed, you may be at your level of incompetence already.

Scientists are still trying to produce life in the laboratory, but it shouldn't be difficult if the laboratory assistant is pretty and willing.

The cave-dweller's wife complained that he hadn't dragged her anywhere in months.

Don't worry about middle age: you'll outgrow it.