How To Disable a Doorbell?

I have this huge problem, well actually two kind of smallish problems. My neighbors boys. Everyday this week they have come over to my house ringing the doorbell to see if my son can play. This week has been really busy, so I have said no every day. Well it never fails that each day they come back four or five times to see if he can play. I am at the point that I am going to march over to their parents house and make a big fuss about it (so much for being friends with the neighbors). I am so tired them ringing our doorbell. I may just have to disable it and tell them to never come over again. (Ha Ha). Anyone know how to disable a doorbell? Any help would be great!