Today’s Rhymes With Orange cartoon, “Tea Time”:
You are expected to recognize, from the title and from the drawing (showing a teapot, teacups, sugar bowl, and 3-tiered tray of fingerfood) that this depicts an afternoon tea — not tea plants in the afternoon, or merely the beverage tea taken in the afternoon, but (from NOAD):
noun tea: … 3 chiefly British a light afternoon meal consisting typically of tea to drink, sandwiches, and cakes.
But that won’t help you with the text, in which one tea sandwich asks of another (identified as female) why the latter brought Joe — Joe clearly referring to the one discordant element in the drawing, who appears to be a hamburger bun overstuffed with a meat filling, some of which has spilled out onto the table. Messy, messy Joe, who “just can’t pull himself together”.
Clearly, that one line, in conjunction with Joe’s appearance, is somehow the crux of the joke. But how?
For this, you have to know a bit about vernacular American foodstuffs, in particular the sandwich known as a sloppy joe. So it’s a pun on the name — and also, it turns out, a gender joke.