Can You Spot What Doesn't Belong? [50 STEEM BOUNTY]

About a year and a half ago I was chatting with Hive account@kevinwong and I shared the following image:

Can you spot what doesn't belong?

The first Steemian to find the artifact will get 50 STEEM. Another bounty of 50 STEEM will be given to the person that actually finds the comment that I'm referring to on the blockchain.

Since I'll be busy all day today, I will just be rewarding the correct answers without much commenting. I got nerd stuff to do!