Playing childish tricks like this on your coworkers is not likely to get you any respect from your coworkers. It may even get you fired if you mess with the wrong coworker and they take it to HR. (Try explaining to the folks at HR how this is not "installing malware on a company machine".)

Also: I don't think that anyone who trusts this web site enough to run a random shell script from it on someone's machine should be the one teaching their coworkers about security.