What is the best way to make a boy jealous?

It is not good to do things like this or play games it really is petty and childish. If you are trying to get his attention because you like him just try and talk to him but if you are just trying to get back at him because he is dating or likes someone else that is just not right. Move on and let him be - I understand that you may be upset that he doesn't like you but trying to make him jealous is not going to solve anything.