My wife may or may not be retarded. Over the last few years, we've established that my kids, as most do, forget to bring stuff home from school. Whenever I used to pick the kids up, I would do a quick inventory of their stuff, and nothing got left behind, ever. My wife picks the kids up now and just asks them if they have everything. As a result, stuff gets left behind occasionally.
What rustles my jimmies today is that it's the last day of school. Naturally, something got left behind today. Out of all the fucking days to not triple check that your kids have everything, you don't do it on the last fucking day of school.