26Gun dog

As of 2015, at least six Americans have been accidentally shot by dogs in the past five years, including by a dog named "Trigger."
27. When a student named William Edgar Smith applied for Georgia Tech in 1927, he was accidentally sent two enrollment forms. He filled out both the forms and created a fictional man named George P. Burdell. William enrolled Burdell in classes and turned in assignments for him. The elaborate prank lasted all the way to graduation day, when Burdell earned his degree in Mechanical Engineering.
28. During a battle of the Korean War, a mortar section was running out of mortar rounds. Instead of ordering more rounds, they accidentally ordered hundreds of crates of Tootsie Rolls, having not specified that "tootsie rolls" was a slang term for mortar rounds.
29. In 2003, a 38-year-old cattleman in Nebraska died after he accidentally injected himself with a cow antibiotic known as Micotil. When he was taken to the hospital, he was informed that there was no known antidote that could help him and he soon died.
30. In 1978, a radio station accidentally played "Imaginary Lover" by the Atlanta Rhythm Section at the wrong RPM, causing it to sound just like Stevie Nicks. Stevie Nicks eventually heard about it and played the record at the increased speed for bandmates, who all believed it was her singing.
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15 Most Controversial & Costly Blunders in History
31Grandma

In 2015, an Italian grandma accidentally sent 2 adults and 3 children to the hospital when she made them cocoa with packets that had expired in 1990.
32. A man named Rene Lima Marin was once accidentally released from prison 90 years early due to a clerical error. He then started building his life by getting a job, getting married, having kids, coaching youth soccer, being active in his church. Authorities realized the mistake 6 years later and sent him back to prison.
33. Landmines planted on the coasts during the Falklands War accidentally created penguin sanctuaries. The penguins are too light to detonate the mines, so they live and breed safely. The sanctuaries are so popular and profitable that there are efforts to prevent removal of the mines.
34. In 2013, PayPal accidentally credited $92 quadrillion to a Pennsylvania man named Chris Reynolds.
35. There are popsicles that don’t melt. After the 2011 tsunami, scientists helping strawberry farmers in Japan salvage damaged crops accidentally discovered that liquid polyphenol extracted from the berries caused the cream to solidify. This lead to Kanazawa Ice pops which can stay frozen up to an hour.
