You shouldn’t mess with graffiti writers.

The longest recorded piece of graffiti was painted by a
student in the toilets of his college at Changsha, China
in 1915. It consisted of over 4000 characters criticising
his teachers and the state of Chinese society.

After completing this masterpiece the student handed
himself in and was paraded in front of the school and
threatened with expulsion. The student was a 22 year
old Chairman Mao. A graffiti artist who later founded
the People’s Republic of China and was responsible
for the deaths of over 30 million people.