Cow Jumped over the Moon

• The entire affair is a misunderstanding. A cow in a pen being held for transportation on the railroad became agitated because of all of the noise the other cattle were making. It jumped over a fence. It was duly reported that a cow jumped over the Moo'n'. Ever since people have believed that a cow beat the astronauts to glory.
• Why is the moon like a dollar? Because it has four quarters.
• When is a moonbuggy not a moonbuggy? When it turns into an airlock.

reference

You know it is so because my cousin told me and he heard it from his brother-in-law's barber.