As a child, i was always told not to jump after a meal because i'd get appendicitis. The appendix is a small tissue pocket that extends from the large intestine. This myth started because jumping after a meal cause lower abdominal pain which is mistaken for appendicitis pains. It is also believed that the myth is still believed because people think that the appendix gets infected when food goes into eat because the person jumped after eating.
The principle of thinking which is used to prove this myth wrong is falsafiability. After much research, it was found that appendicitis has nothing to do with jumping after eating at all. It is actually caused by the infection of the appendix when it gets clogged with faeces or growth.
The claim of food going into the large intestine is also an extraordinary claim because the large intestine is the last step of digestion. By the time the food reaches this part, it would have already been converted to faeces. It would be impossible for the food to enter the appendix from the stomach even if you do jump immediately after you eat. By using the principle of Occam's Razor, we decide on the more logical option of the appendix getting infected by faeces of growths instead.