It's titled 'Sometimes It Just Depends On Us', and the Portuguese legend overlaid on the cartoon reads: "Choose the happy side of life!" Which is nice, if a little over-optimistic if you happen to be sat on the grim side of the bus aisle during a grisly, jam-packed 7 am Tuesday run through Warrington. There is no sunny side of the bus in Warrington.
A very simple one, which perhaps explains its brief ubiquity. There's something very cute about it, something very not-2021. That's probably because it comes from 2013, one of the years in Earth's existence you could accurately describe as 'not 2021'.