1. George Barber had a bunch of enormous dinosaurs built and randomly placed around the 10,000 acres of woods he owned.

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via RoadsideAmerica

The dinosaurs were built by artist Mark Cline - and Barber also hired him to do a few more Insane Rich Guy things:

 

Install a statue of an enormous woman in a lake.

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via RoadsideAmerica

Create a fiberglass recreation of Stonehenge in Alabama

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via RoadsideAmerica

 

2. On April 1st, 1989, Richard Branson sent out a hot air balloon designed to look like a UFO and hired a dwarf in an E.T. costume to come out and scare anyone around when it finally landed.

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Wrote Branson:

It was great fun watching their reactions. What we didnt know was three police forces had been mobilised, the army had been alerted and radio and TV stations had all gone on the air about a UFO flying low over London!

The police surrounded us and then sent one lone policeman with his truncheon across the field to greet the alien. The UFOs door opened very slowly, with tonnes of dry ice billowing from it. A dwarf that we had carried on board, dressed in an ET outfit, walked down the platform towards the bobby. He promptly turned and ran in the opposite direction! The police initially didnt see the funny side of it and threatened to arrest us for wasting their time. But they soon joined in the general merriment of it.

 

3. Vladislav Doronin built his then-girlfriend, Naomi Campbell, a massive mansion in Moscow designed to look like a Star Destroyer

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via Zaha Hadid Architects