Several epidemics throughout history have many similarities in characteristics. For example, many diseases evolved from poor hygiene between animals and humans and a rise in urban population and interregional communication. Many had very similar effects and modes of transmission.
Because of the similarities, many historians are looking into allegations of these diseases stealing each other's methods, committing plague-iarism.
What Time is It?
A man has to drive for a few days to get to his new house.
After a long and tiring drive throughout the night, the driver decides to pull over on the side of the road to take a nap.
A man knocks on the car's window and this wakes the driver from his sleep. The man asks the driver what time it is. The driver looks at his watch and replies, "It's 8 AM" and goes back to sleep.
After a while, another man knocks on the car's window and wakes the driver from his sleep. This man also asks the driver what time it is. The driver replies "It's 8:05 AM" and goes back to sleep.
Sure enough, after a while, again, another man knocks on the car's window and asks the same question. The driver, now annoyed, replies, "It's 8:07 AM". He picks up a piece of paper and writes in bold letters "I don't know what time it is!", sticks it on the car's window and goes back to sleep.
The driver is again woken from his sleep by a knock on his window. The man knocking on the window says, "It's 8:10 AM, you're welcome!"