I take the boots for a jog in the clouds. It must be nice to walk on the clouds. Your feet aren't as tired as after you jog on solid ground and injuries less likely to happen.

I leave the clouds, which have become rain and then become flash flood, to the next user.

I use the flash flood to wash out the dry creek beds near Medina, Texas.

I leave the next user the entire U.S. Debt.

I use the US.debt to make a plan for hacking entire US financial systems and,
leave some 100's of $ for next one...

I decide that the dollars aren't heavy enough, so ?I convert them into (British) pounds, then leave that weight for the next user.

I notice the hundreds of pounds are in the form of gold and load them into my shirt to drag on the ground until I return home. The shirt is shredded into oblivion just as I stash the gold in a crawlspace; I leave a pair of striped shorts that I just now grabbed off the curb of a Subway parking lot after having breakfast with my parents.

I keep the 50 and 20 pound banknotes safe in my wallet. The remaining one penny and two pence coins I modified. I put Boris Johnson and Richard Branson's faces on the one penny and two pence respectively and leave them to the next user.

* I just got ninja'd. The thing I mentioned above happens in another parallel universe.

I grab the shorts and the pennies and, needing neither, leave them for the next user along with a bottle of gin and a lot of time to think about how these items might be combined.

I take the time. I take the shorts and coins to the nearest security guard's office and report them as missing belongings.
I take the gin and emptied it. I rub a magic lamp to call the genie inside. I tell the genie to live inside the bottle instead.
I leave the genie in the bottle to the next user.

I speak kindly to the genie and she tells me what three wishes she would like. I grant them and she leaves happily.

I leave the next user a round-trip ticket to Texas and back and an invitation to attend my September "End of Summer" party.

I decide it's too risky to travel to Texas, so I switch the two vowels, so that it reads "Taxes", and send it back to the sender.

Except that, instead of going back to the sender, it goes to the next user.

Having a round-trip of Taxes paid for me, I decided to pay for plane tickets to Texas, as now I am tax-free and can now spend the $5,000 of my needed to pay Taxes for vacation. Unfortunately, after purchasing my ticket from a shady booth next to a gas station, it falls out of my hand and is blown away into the next users face like in movies.

Because the ticket has blinded me, I stumble into traffic and leave a flattened corpse.

I take the flattened corpse and pump some air into it. I leave the human figure balloon to the next user.

I give the flattened corpse to a necromancer and the wallet that was on the corpse, nary a trace of gore on it, I leave for the next user.

I take the corpse and offer it to the God of Slaughter (Charnel.) He uses it to create a new, improved version of Netherfiend and I leave a book of spells from my time spent in his service and Charnel's gratitude for the next user. I use the money inside the wallet to buy 3000 lottery tickets, which I also leave for the next user.