Mobstr is a street artist based in the UK and is widely known for the sarcastic messages he leaves around random walls. He goes around empty walls writing different messages, some of them are humorous while others are sarcastic. After looking at some of his work, I can say that it feels like something Banksy would do, except that his work has a different vibe to it.
Unfortunately there isn't more information about the artist himself since he prefers to remain anonymous, but that makes his whole work that much more special. Keep an eye on his quotes, you never know where they might pop up!
– Fajer Al Farsi