Helen Keller's Burn

Okay, listen up, buttercup. This joke is about Helen Keller, who, BTW, was deaf and blind. The joke plays on the idea that she "answered" the iron, meaning she put her face on it. Then, for the second cheek, "they called back," implying the iron got hot again. It's funny 'cause it's so wrong, and you're probably laughing 'cause you have the humor of a kindergartner.