This puzzle was originally created for a group of my friends to solve together. Because it is meant to be "interactive" the description of the setup here is fairly straightforward because I'm describing it via paragraph instead of via visuals.
In front of me I have an Altoids tin and many small pieces of paper. For each line below, I write it on a piece of paper, then crumple it up and put it in the Altoids tin.
I am sick.
I am healthy.
You are poor.
They are wealthy.
Then, I have another friend who offered to help do the same with the following lines:
That is solid.
He was plasma.
Chuck Norris is Texas.
We were Alabama.
Then, we pass the tin and paper around, asking people to try to write individual lines that can also be put in the tin. If their line works, I allowed them to crumple it up and put in in the tin. (If their guess didn't work or did work, I would tell them, so I will confirm phrases in the comments)
A few failed attempts that my friends made:
How are you?
And some that were a bit closer, but also failed:
You are stupid
This is confusing
I like trains
And the first successful one:
It is liquid
So, come up with some lines (ideally with varying formats) that can also be put in the tin. Explain why they work.
Once you've done that, there's one last question. In two words, what are we doing?
The final two word answer also involves wordplay.