Not Me and I Don't Know

I guess gone are the days when my kids got all excited about being helpful. Or maybe it's just a quick phase.

Normally I will ask them to feed the dogs and they fight over who gets to use the red cup (instead of the green cup) and they keep on filling the dish until it's practically overflowing and I have to tell them to stop.

But yesterday I said, "Who wants to feed the dogs?" and these are the responses I got:
"not me!"
"I don't want to"

Ugh! They're banding together against me! Instead of blaming each other when I ask "who made this mess?". Now I get:
"I don't know"
"Not me"

Damn these I-Don't-Know and Not-Me people. Think I could get tax deductions for Not me and I Don't Know?