I did something similar in high school. You dropped a file named "System.java" into a Java project, which then intercepted all calls to System.out.println() and

I did something similar in high school. You dropped a file named "System.java" into a Java project, which then intercepted all calls to System.out.println() and, for example, printed the text backwards, very slowly, or googled the text in Firefox: https://github.com/blinry/fake-java-println https://github.com/blinry/fake-java-println