With so many A is for... books on the market, I just had to laugh when I found out there called A Isn't For Fox! It fits first grade humor perfectly! It's a good thing I get to buy books for my classroom since I don't have children of my own yet!
A really neat picture book is Voices in the Park. I don't know the author off hand, but it was a great read aloud for a class discussion. The main idea is that people bring different perspectives to life. There are different characters in the book who all are in the park at the same time. You see the perspective of the children and the adults. When I used this with my fourth graders last year, they really got into explaining what they felt each character was thinking. I believe I used it as a warm up for a writing piece in which they were working on point of view.