What are some dark, little-known facts about past US presidents?

Oh, wow, where to begin? In no particular order:

• Calvin Coolidge had a … unique breakfast ritual in the White House. Each morning, while he ate a breakfast of boiled wheat and rye, he would have a servant massage his scalp with Vaseline.
• Benjamin Harrison was terrified of electricity. After electric lights were installed in the White House in 1891, neither Harrison nor his wife would flip the light switches for fear of electrocution. They had servants turn the lights on and off for them.
• During his 8 years as President, Ronald Reagan’s wife, Nancy Reagan, consulted an astrologer before scheduling any events. According to astrologer Joan Quigley, she picked the dates for all press conferences, most speeches, takeoff and landing of Air Force One, and Presidential debates.
• John Quincy Adams believed the Earth was hollow. In fact, he approved funding for a mission led by John Cleves Symmes to lead an assault on the North Pole to find the entrance leading to the center of the Earth.
• Ulysses S. Grant couldn't stand the sight of blood. Even a rare steak made him nauseous, and he was known for cooking his meat until it was charred.
• Grant also has the distinction of being the first President to get a speeding ticket. He was cited and fined for driving his horse too fast in Washington DC.
• Gerald Ford was a fashion model in his younger years, once gracing the cover of Cosmopolitan magazine. He was even part owner of a modeling agency.
• Herbert Hoover demanded that the White House staff be invisible. Any time Hoover or his wife entered a room, any staff present were required to quickly jump into a closet to avoid being seen.
• Thomas Jefferson was a terrible public speaker, suffering from a severe case of stage fright. He only gave two Presidential speeches to the public during his 8 years in office … one per term.
• Warren G. Harding suffered from a serious gambling problem. In fact, he once lost the official White House china in a poker game.
• James Garfield wasn't killed by an assassin's bullet … but by the doctors trying to save him. Using a newly designed metal detector (invented by Alexander Graham Bell) to locate the bullet, the physicians instead located the metal springs in the mattress underneath Garfield. They proceeded to cut in the wrong place several times. The ensuing punctured kidney and streptococcus that killed Garfield weren't caused by the bullet … but by the doctors.
• Bill Clinton once lost the nuclear launch codes … for months. A Pentagon official was sent to inspect the codes every thirty days, and the codes were changed every four months. For four months, every thirty days, the inspector was told that Clinton was “in a meeting,” but that the codes were safe at hand. The missing codes were never found.