When does a Pentagon have only 4 sides?

When it is intercepted by a plane.

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4 Jokes More 4 Jokes

What has 9 arms, 7 legs, 4 heads, and 13 feet?

The finish line of the Boston Marathon.

How to 4-dimensional aliens get around?

In Tralfamadoloreans.

Plane Jokes More Plane Jokes

How did the pilot like his hotdog?

Plane.

What's the difference between most people and planes?

Most people miss the twin towers.

Intercept Jokes More Intercept Jokes

When is a pentagon not a pentagon?

When it's intercepted by a separate plane.

When does a Pentagon have only 4 sides?

When it is intercepted by a plane.