This is a public service graffiti
What do you think of this?
"First Graham Bell astonished the world with the telephone, then he spooked the criminals". It isn't very clear, but above this main text there is a telephone number in red with the text "Disque Denúncia" - it's a police number so you can report criminals.
I spotted it a little while back near Jardim Botanico and it sent me running for my dictionary. Assombrou is the third-person past-tense of Assombrar – which can mean haunt, amaze, astonish, stupefy, petrify and a bunch of other translations. When I asked a colleague they suggested that in this context you might use ‘freak out’, i.e. he astonished the world and then freaked out the criminals.
Anyway, however you translate it, it’s an unusual piece of graffiti isn’t it? So often graffiti seems to be anti-establishment and here is something encouraging people to inform on criminals!