I made a pencil with two erasers. It was pointless.
Why this joke works
A Pencil Without a Point
A sharpened pencil needs one writing point, but putting an eraser at both ends removes that useful tip. “Pointless” therefore describes the pencil's physical design and says the invention has no purpose. Deliver the first sentence like a sincere report about a clever new school supply. Pause before the verdict, then say “pointless” plainly. The joke works best when the second meaning arrives without extra explanation, helped by the listener picturing both erasers.
A closer look
The Invention Explains Its Failure Visually
The first sentence sounds proudly experimental and lets the audience picture a normal pencil before changing one feature. “Two erasers” initially seems like extra usefulness. The verdict then forces both ends of the object to be redrawn, leaving nowhere to write. Because “pointless” also judges the whole project, the speaker’s concise review covers design and purpose at the same time.
Fact behind the joke
Pencils Combine Several Materials and Traditions
The Smithsonian’s drafting collection includes writing instruments made with materials such as wood, graphite, plastic, slate, steel, brass, and ivory. What is casually called pencil “lead” is normally graphite-based rather than metallic lead. An eraser and a sharpened graphite core perform opposite jobs, so placing erasers at both ends removes the functional writing end rather than improving it.