I'm wondering how likely or even how frequently this situation would ever occur? First of all, I'm a little confused by the scenario. If you're sitting at a breakfast table in your home and there are only family members present, this would be sibling rivalry in the extreme, or your parents or spouse have tried just about everything else to get through to you. On the other hand, if you are in a public place, such as a restaurant, I can't imagine anyone would have the audacity to sneak up behind another patron and push his or her head into a bowl, whether it be cereal, soup or ice cream that is being consumed. Yes, there probably are some table maneuvers you could try, or if you're skilled in any of the martial arts, you could probably take advantage of your attacker's position, as in, the-bigger-they are-the-harder-they-fall, with the end result that said attacker could end up on the floor with milk and flakes all over the place. But I think what you're really asking here is how to avoid a surprise attack. I suggest sitting in a spot where you have full view of the entrance. I hate sitting where I can't see the entrance -- not because I'm especially paranoid, but it just doesn't feel comfortable. Or if that's not possible, try and sit where the back of you is protected, such as against a wall, or back to back with another diner's chair. As you have probably heard, an ounce of prevention is worth a pound of cure. Lastly, the odds against this ever happening to you, are definitely in your favor. Good luck! Goldiemae