1. Marine biology graduate Alex Endon from San Francisco has found a way to apply his knowledge to entrepreneurship. He decided to breed unusual pets - jellyfish. Endon invested $50,000 in his startup. A year later, his income grew to $250,000, and later to $500,000.

2. Gary Dahl, an American, suggested getting an even more amazing pet to his compatriots. In April 1975, he was relaxing at a bar with friends and listening to them complain about their dogs and cats. They spoil furniture, bring dirt, get sick, require food and care. Then the man first thought about the ideal pet, which is devoid of these "flaws". He laughed and told his friends that a stone could become such a pet. The costs paid off very quickly. In six months, Dahl sold 1.5 million stones for $4 each and became a millionaire.

3. The business idea of ​​Kim Lavigne from Alabama also came out of the blue. One November day, she was sitting at home and sewing clothes. In parallel, the woman watched her husband in the backyard feed the deer with corn kernels. Kim thought these grains could be sewn into a pillowcase and made into a relaxing pillow for the kids. Lavigne spent the money she received on improving and promoting her product. Over time, she expanded her range of products, became the owner of a multi-million dollar fortune and wrote a book about her success story.

4. Briton Alex Tew in August 2005 needed money to pay for his studies at the university. Instead of looking for a part-time job, the 21-year-old decided to start his own online business. He created an unusual advertising platform - a website with a million empty pixels. Tew started selling them for $1 each. In just five months, an unusual project brought its creator more than $1 million.

5. While walking, Ken and Roni di Lulo from California noticed that their dog was squinting and whining in the bright sun. Then Roni took her old swimming goggles and remade them for the Border Collie. A place on the list of the most useless inventions did not affect sales. In just a few years, dog glasses brought the creators $ 3 million. Now the accessory can be bought at a price of $ 14 to 25.