The kid throws paint all over the house and the only thing the idiot parent can think of is to snap a picture. Personally the only thing I would have snapped was the rugrats neck
Actually, getting it on a picture is the best response! There's nothing you can do that would improve the situation, and beating/yelling will only make the kids resent you and breed dissent (not to teach kids to hit their own kids, and perpetuate the abuse).
Once you have those pictures, you dock their allowance until their part of the clean-up is paid off. Then, when they're 12, you use that picture to shame them into doing chores :-)