In 1978, Berkeley scientists did a study on the effects of GoTo on rats. Twenty rats in a control group were fed a normal diet, while twenty other rats were forced to program in Apple BASIC. Their health was to be monitored for a month, but after two weeks all of the rats in the programming group had melted into a dense goo that tasted a little like quiche.
But some rats learned to execute GOTO END_OF_MAZE, and finished in record time, while the nested block rats took too long to climb into and out of nested boxes to get to the end.