Times & Irish Daily Mail “The Scream” cartoons: this actually happens all the time.
Gerard Scarfe in the Sunday Times
Graeme Keyes, Irish Daily Mail. (Both images via Fleet Street Blues)
convergent humour
There are No Original Ideas in Editorial Cartoons!
I winced when I saw this cartoon on Cagle’s Cartoon Index because it was followed immediately by 
This is exactly what every editorial cartoonist lives in fear of: that someone, somewhere, has had the same idea as you. If anything drives a cartoonist it is to be distinct by virtue of originality. This is an example of convergence.