One thing that cracks me up about little boys are thier "sound effect" faces. Whether it is a car, gun or animal noise, thier little faces are so cute, like they MEAN what they are doing! All business. Adam makes great sound effect faces, here are a couple:
This one really cracks me up. Even Nick looks amused and Ive caught him with Sound Effect Face before too. I just dont have pictures to prove it, yet.