Okay, I'm not sure if someone's done this before, but here goes...
The first player will leave a gift for the next user. Then, the next user will pick up that gift, use it, sell it, and leave a new gift for the next user. You can also include a picture of the girt you are leaving, if you want.
Then it continues for, like, all eternity. Or something.
Example:
A: Leaves a unicorn.
Spoiler

B: Picks up unicorn.
Flies around, throwing water balloons at innocent bystanders.
Sells unicorn on eBay.
Leaves a public library.
Spoiler

Get it? Okay, let's start:
I'll leave a bottle of Windex.
Spoiler




