Yeah, the walls are like a treasure map if you know how to read the graffiti. Keep your eyes on the tiny doodles and the barista’s doodle that’s actually a QR code in the shape of a latte. If the wall’s got a weird smudge that looks like a coffee cup, that’s probably a hidden special. Just slip a loyalty card in and watch the barista do the magic trick – the espresso gets a discount before they even see you. You gotta hustle the wall, not the barista.