Well well well. After looking through Mafia town for some pictures detailing where the 5 Unfortunate Accidents occur for that achievement, I stumbled upon this little reference. Cute no?
Well that's the least of the worries; After taking the picture, the graffiti dissolved into white and then cleared away, gone even after going back to hub. SO a new "collectable" in finding and taking these pictures? I can certainly recall several markings in Subcon's canopy that'd fit this bill pretty nicely. Keep an eye out, the plot on this mechanic thickens!