Jeremy and I use the the line "That's what he said/that's what she said" now and again. Okay - fairly often. It's become a joke as I tend to use it at the wrong times and it doesn't make sense which makes us laugh more.
Julia was working on her snowman picture/drawing and had written "ho ho ho ho ho" all over it. She then asked me "How do you write 'that's what he said?'