I was once outside a friend's flat, waiting for her to wake up and let me in, and a friend of hers turned up. She was an absolute knockout, and we were getting on really well as we waited, it felt like we'd connected... then there was a silence, and for no comprehensible reason, I said, "I feel like a burglar." She said "Why?" and I couldn't think of a reason. It went downhill from there.