I throw the card to a duck and then weave my way over to the left a bit before dropping my (cargo) load for the next user.

I take a look at that cargo, find a crate, and write a rust program that uses that crate.

I then throw the resulting computer program at the next user.

(Programs written in the programming language rust use a program called "cargo" to install libraries, which are called "crates".)

I jump up, headbutt the program out of mid-air, and leave the shattered remains of it for whoever finds it.

I recompile the remains using Java and leave the resulting program (TotesLinkinParkAlbum.mp4.exe.bat) for the next user.

I take the batch file, and rewrite it in Haskell, without using the IO monad. I then leave that program, which is useless due to not having any way to interact with the outside world (no IO, for example), for the next user.

I organize the useless batch file into a collage of Larfleeze and leave it as a mural on the side of a small business, with the owner's permission.

With the owner's permission, I paint over the mural with another mural containing a magazine.

I then throw that magazine at the next poster.