Every summer, a handful of visitors to Yellowstone National Park ignore the rules and do something, well, stupid. Here are the incidents from … 
 
 Safety in thermal areas 
 
 Boardwalks and trails protect you and preserve delicate thermal formations. Scalding water underlies most of the thin, breakable crust in thermal areas. Pools may be near or above the boiling point of water and can cause severe or fatal burns. 
 
 Keep children close at all times and make sure they understand the dangers. 
 
 Pets are prohibited in thermal areas. 
 
 Swimming or bathing in thermal pools or streams, where water flows entirely from a thermal spring or pool, is prohibited. Where swimming is allowed, swim at your own risk. 
 
 Thermal waters may contain organisms know to cause infections and/or amoebic meningitis, which can be fatal. Obtain more information at any ranger station or visitor center. 
 
 Toxic gases may exist at dangerous levels in some hydrothermal areas. If you feel sick, leave immediately. 
 
 Source: go.nps.gov/yellsafety 

 The man fell into the hot springs of Norris Geyser Basin Tuesday afternoon. (YNP photo) 
 
 A Yellowstone National Park visitor is presumed dead after a witness reported seeing the visitor fall into the Norris Geyser Basin Tuesday afternoon. 
 
 Park spokeswoman Charissa Reid said a search is underway for the man who disappeared in the hot spring. 
 
 Reid said the man is presumed dead because he has yet to be found, "the recovery process is very difficult because of the hazards of the environment,” said Reid. 
 
 Reid said the man is in his 20s, but she would not identify the man or where he is from. The man reportedly walked about 225 yards off the board walk before falling in to the hot spring. 
 
 The springs are known to reach temperatures that would be deadly to humans on contact. 
 
 Yellowstone Park officials said Tuesday evening that The Norris Geyser Basin is currently closed and an investigation is ongoing. 
 
 Officials said they would release no further information until tomorrow, as it becomes available. 
 
 "Norris Geyser Basin is the hottest and most changeable thermal area in Yellowstone," according to the YNP website. 
 
 Reid said she wanted to remind people of the danger of the springs and directed all visitors to the safety page on the YNP website. 
 
 Earlier this week, a teenage boy and his father suffered thermal burns near the Castle Geyser. They were flown to Salt Lake City for treatment. 
 
 RELATED: Men walk on Grand Prismatic Spring in Yellowstone National Park
– A man in his 20s who wandered some 225 yards off the boardwalk and was spotted falling into the Norris Geyser Basin in the Yellowstone National Park in Wyoming on Tuesday is still missing and presumed dead, park officials say. MTN News reports that a search is underway, but the recovery process is "very difficult because of the hazards of the environment," a park spokesperson says. The Great Falls Tribune reports that some hot springs in the park can reach 200 degrees Fahrenheit—enough to be instantly fatal. The mishap comes on the heels of several other incidents at Yellowstone recently. Over the weekend, a 13-year-old boy slipped out of his father's arms and fell into a hot pool at the Upper Geyser Basin and had to be flown to a nearby hospital to be treated for burns, reports the Billings Gazette; his father also suffered burns in rescuing the boy. And in May, a bison calf had to be euthanized after tourists who were concerned it was cold loaded it into their SUV, a film crew was cited for leaving the boardwalk and going onto the Grand Prismatic Spring, and a woman was charged by a cow elk when she got too close. The park service asks visitors to remain at least 25 yards from all wildlife, and four times that from bears and wolves. (One park rep says people get over-zealous especially in selfie quests.)