I spotted this on the streets of Rosemead. It's a shopping cart from Walmart, with some random stuff in it, and an open box of Cards Against Humanity strewn across the seat. CAH is a "game" that works like "Mad Libs" and gets laughs by being "politically incorrect". Random juxtapositions of text are sometimes funny, but by including language that mocks some marginalized people, it's easier to get a cheap laugh. This photo is a random juxtaposition of stuff, and the subtext is that there's someone in America who is suffering and homeless. It's also a commentary about a society that produces both CAH and homelessness.
https://en.wikipedia.org/wiki/Cards_Against_Humanity#Criticism