I sow the fabric back into my micro-camera suit; it's not needed for invisibility, but I need to keep dust particles out of the cameras.

I leave a DVD of the biopic Monster, about a female serial killer.

I come back from the other dimension because I can't get used to their laws of physics. Also, a friend of mine is about to get married and I wouldn't want to miss that. This DVD will make a nice present for him.

The laptop, based on quantum technology, that I brought with me doesn't seem to function here. I leave it for the next user.

I remove the computer's panels and find that the insides are an exact match for New New York from Futurama. What's more, reaching into it causes a shrinking effect so that I'm just a little taller than Farnsworth's observatory, making it a perfect spring-board to create the most complete Lego Futurama model ever.

For the next user, I leave the Killer Instinct (for Xbone) soundtrack that I found in the grass outside the mall on Black Friday.

Take the soundtrack and plug a big speaker in the mall with an Xbone I found in one of the stores. Lots of windows shatter accidentally and a power outage happens. The speaker stops.

I leave the next user this powerful music tool that can also break safes, doors, and passwords since I have no use for it.

I take the powerful music tool to rob a bank.

I leave the mask I used for robbing for the next user. The mask looks like Robin Hood's facial appearance.

List the mask as the official mask used in batman movies and sell it for a fortune.

Leave behind the mask that the next user bought from me on ReallDeal

Ninja'ing the next user, snatching the mask, replacing it with a bag containing a hipster's beard shaved off the face of the previous user, because I AM Robyn Hood and that mask was molded from my likeness while in a drunken stupor on somebod's couch last Friday.

Find my beard in some bag left suspiciously in my left hand as I see some shadow scaling the roof of the mall and climbing out the skylight. Put on my bayman suit, go to the bayman cave, and call upon Robyn Hood for help to find the hero who helped shave my beard off for free.

Leave the bayman cave open accidently filled with strange gadgets for the next yourtube explorer that stumbles upon it

In the Bayman Cave, take a shrink-ray and invisibility suit and I leave the several dozen baby carriers/car seats that I've seen and ignored on peoples' curbs over the years.

Turn the T.V on and find that some invisible man was able to shrink and steal all of the largest jewels in the world. However, when I go to grab my equipment, all of it is missing and I leave my duty and a random number for the next user on a piece of paper saying, "This person got the goods to supply you with anything you need".

Wait a minute! That's my girlfriend's phone number! But she really got all the goods I needed, so I'm not even mad.
For the next user, I leave a big bag of apples to keep the doctor away for some time.

Eat all of eat and do not have to worry about my teeth enamel since I am a frog. "Don't ask how I was able to eat the baskets of apples." Thanks, I get to stay away from the vet even though I do not live in human society and live in the jungle.

Leave behind lots of apple tree seeds that are ready to be planted and fertilizer made from the remains of the apple that I spit out.

[I take the apple seeds and plant one immediately and place the fertilizer on top. Then I travel across country, planting seeds in each community I visit.]

I leave the next person a book about "Johnny Appleseed".

I trade the Johnny Appleseed book at the nearest Little Library for a tiny Psalms/Gospel and leave that for the next user.

I take "that" and analyze what "that" could be used for. With my 5 page research about "that", I slam it into the floor and it shapes into a black hole. I get sucked in and leave behind a peculiar device that has unknown powers for the next user.

(Hi MichealD, I understand what you meant but just took it out of context if thats all good with you.)