What’s not to like about Octopi? They have eight arms, can change color, have an ink sack, and are extremely intelligent.
What’s not to like about coffee mugs? They hold coffee, other liquids, maybe even solids if you are daring.
Combine the two and you get a coffee mug with an octopus in the bottom. Not just some painting of an octopus at the bottom of your cup, but a 3 dimensional octopus emerging from the briny depths of your coffee.