The Seattle aquarium wasn't the best, but eh, still worth a visit, so we had a look while in Seattle.
nice size octopus
The pygmy cuttlefish they had were both cute and fun to play with (I kept them interested and occupied with pictures through the glass). Have look at the video, those things are super intelligent, they check you out, change colors, and raise their tentacles when they're ready to pounce. It got even more funny when I showed them a picture of a small crab on my phone: