While the reasoning is still unclear, someone dressed up as a T-Rex and kayaked their way through the Chicago River.
The thought process must have been a delight to witness. "Hey! I got this T-Rex costume and I'm thinking I should do something really cool with it. What's something that requires a lot of arm movement that would be difficult to do in this costume? Kayaking? Perfect."
I don't understand how the other people kayaking aren't making more of a scene about it. But who knows how long this went on? It could be totally normal for them now.