On Thursday afternoons I volunteer at my son's elementary school, working with the advanced spelling and math group. They are usually pretty good kids, but today they were awful. They wouldn't stop giggling and interrupting and just being loud.
Finally I said "What would the principle say if she walked past right now and heard how loud you're being?" To which one smarty-pants replied "She'd blame you 'cause you're letting us."
Sad thing is, he's probably right.