Spotting Unusual Graffiti on the Internet

I guess the title says most of what this post contains. Here are some interesting words that have been illegally placed on buildings and other man made structures around the world:

In my opinion, I love all three of these. Not only do they make me laugh, but they are not something I normally see. Most of the graffiti I see is tagging - which I personally hate. 

I enjoy the graffiti that shows the artist has a lot of skill, not just the paint and the urge to vandalize a building. I guess these don't take much skill, however I enjoy them just as much as professional graffiti. 

The problem I'm having is answering this question: Are these examples of Graffiti or just vandalism?

Are these pictures art or just words? Or both?

Just something to think about. I would love to hear some opinions!