the Door Bell game

My son, James has a unique (okay its weird) sense of humor like me. When he was younger, I taught him many things but one innocent game came to mind recently that i have passed along to my youngest daughter (3yr old now). Upon seeing his bellybutton, i would push it and make a sound of a door bell. Laughing and running from mom was always followed. But like all good things, it also could be seen in a different way. I discovered this while James went laughing into his grandparents house (just to set the scene, James does have a bit of a scary laugh, reminding me of the villain laughing at his fantastic new evil plan.) . With my curiosity peeked, I ran in the house wondering what was about to happen. The house was full (all 12 children and their families were over) yet eerily quiet. So as his yells echoed throughout the house, I fell to my knees and tears running down my cheeks (from laughing so hard) , I heard.... " Grandpa, Grandpa!! Wanna see my ding dong?!"