"The comic strip character Dennis The Menace featuring a young boy in a red and black striped shirt debuted on March 12, 1951 in 16 newspapers in the United States. Three days later in the UK a character called Dennis The Menace, wearing a red and black striped jumper made his debut in the children's comic The Beano. Both creators have denied any causal connection."
-my old teacher used to say about phenomenons like these that sometimes ideas lie in the air and it's just a matter of grasping them. they don't belong to you, you can just catch them. and sometimes two people catch them at the same time.