You guys don't need to say...
I was once painting a lanscape in oils. It was getting close to lunchtime and Toby wanted food, but I wanted to finish the bit I was doing. OK, I ignored him at my peril, and so to empasize his point, he jumped up and sat on my paint palette right in the middle of a large patch of green paint.
So I now had a green-pointed black cat; his mum and feet were all bright bloomin' green!!!
Of course as soon as I yelled at him he jumped down and ran across the floor before I could grab him, leaving a trail of green pawprints on my wooden floor. It took years for the prints to fade out.
My concern was to catch him before he started grooming himself because oil paint is pretty nasty stuff. I did just about manage that, and he was immediately subjected to the indignity of a rapid and thorough bath.
Needless to say, I now don't ignore his requests for food when I am painting!