Wandering back to the office after lunch, my head in the clouds, lost in thought, I was rudely accosted by an unshaven man with a bandana on his head. "Oi! Where do you think you're going?"

I stared at him, wondering what I had done to anger this stranger. Then he broke into a smile, and I realised he was someone I knew. But who? He continued looking at me, an expectant smile on his face, so I smiled back and said "oh, hello, how are you?", all the time rifling through my mental filing system [Is he an ex shag? No. Is he gay? No. Did I used to work with him? No. Oh, I know, it's... it's...]

"Mo. What are you doing here?"