I had been showing my sketchbook to some Y2 children in Leeds and did a quick demonstration of the watercolour pencils and waterbrush I use (kids always love it - magic paint). I must have not quite screwed the top back on my brush properly: when I started to use it later on the train home, I suddenly has a small lake on my sketch!
I didn't want to blot it off, as that would definitely ruin the drawing, so I blew on it, fanned it and tipped it back and forth, trying not to spill any of the inky water in my lap. It took the rest of the journey home to dry. I still had to walk through Sheffield Station wafting my open sketchbook back and forth in the air (what an attention seeker).
The real school visits season is yet to begin: there's always a surge around World Book Day. I am doing another couple of days next week, then have a week's grace before it really starts and I am visiting somewhere different almost every day for a fortnight. Luckily, I have just about finished visualising the new stories I need to show to my publishers, so everything is under control (phew).