"Make me a sandwich!" said Johnny to his mother, hoping that this time she would do as instructed rather than return with a sandwich in hand, amirite?

When I ask my mom to make me a sandwich or something, she always says "Poof! You're a sandwich" :)

Is there something I'm missing from this post? All I'm getting is that he wants her to make a sandwich, but he's mad that she returns with a sandwich...