/fgltt/ - Funny GNU/Linux Troll Thread

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How do you fuck with people that use GNU/Linux and don't know enough about it?

I've got a roommate that uses Ubuntu and I chrooted into his system from a live Arch usb stick while he was sleeping, set up an ssh server, installed mpv, xdotool, vim, tmux, redshift, unclutter and a couple of other things.
I changed his root password (it's not like he uses it on Ubuntu anyways) and enabled ssh-ing as root.
I also set up a directory in his home called .sysdoc in which I put some simple scripts I, some troll videos and soundtracks like Salil Sawarim.
This is one of the scripts (others do some trivial things to make my job easier):

#!/bin/bash

mpv --no-video lilith.ogg --start=01:01 &

while true; do
    redshift -O 1000 > /dev/null
    xdotool mousemove "$(shuf -i 0-1365 -n 1)" "$(shuf -i 0-767 -n 1)"
    redshift -O 25000 > /dev/null
done

It rapidly changes screen color from red to blue and randomly moves the mouse across the screen, while playing some dubstep soundrack from DMC I had laying around.
I can use xdotool to move his mouse a little just to get him curious at first, unclutter to make it totally disappear and then maybe run the script, all from my phone (using connectbot as the ssh client) while lying in bed.
Maybe I'll put a timer on some commands, so when he initialy calls me to check his laptop and something starts while I'm there, he has no reason to suspect me.
When I change the DISPLAY variable to :0 I can also play some videos like https://www.youtube.com/watch?v=ZZ5LpwO-An4 (is there a way to prevent him from closing them?)

What do you think /g/?
Do you have any suggestions?

Also, how do *you* fuck with GNU/Linux users?