I've been coming up with a lot of SCP ideas lately, some of which went straight to Fragments because I either couldn't think of complete details for the SCP or just didn't think I could pull them off. Here are a few ideas I think I can pull off, let me know if any of them sound any good:
Eye Bleach (SCP-J):
A half-full gallon (or whatever the Metric equivalent is) container of [REDACTED]-brand bleach. Making direct eye contact with the contents of the container makes anyone viewing the substance feel a painful burning sensation in their corneas in addition to a mild headache. Both these symptoms subside moments after looking away, but the viewer's memory cortex, specifically the area relevant to imagery, will have been damaged, resulting in irretrievable loss of the viewer's most recent visual memories. Plans to use this SCP in the development of a reusable amnesiac are being considered.
Warp Flies (SCP-EX):
Got the idea from the failure of "The Lonely Stray" as an SCP that's harmless but uncontainable. Basically, it's a species of fly that teleports, which makes them incredibly hard to kill or capture, though the former is still possible. In light of this, the Foundation either had to release a memetic agent to the general public that implants an almost instinctive aversion to flies and a desire to kill them on sight, or such an aversion was already present and the Foundation simply ceased official attempts to contain them since the general public didn't need to know that fly they've finally killed after five minutes of failed attempts is actually the eighth one they've encountered since the start of their attempts and not just a single very sneaky one.
The Overlord (name not final, ideas welcome):
A DVD disc with the words "██████ ██ ████ [in other words, I haven't thought of a name for it]" written on it in black marker. Disc is apparently compatible with apparently any disc-using device, such as DVD players, computers, or home game consoles. Using the disc in any of the latter devices reveals the disc contains an indie game, bearing the title written on the disc, about an unnamed protagonist battling in a post-apocalyptic city against extradimensional entities under the command of their humanoid overlord named [NAME UNDECIDED]. (playing the disc in a DVD player results in [DATA EXPUNGED] and is forbidden by O-5 mandate.) The game itself shows no anomalous properties aside from some notable design flaws (no HUD's, no menus of any sort) and the main antagonist's tendency to break the fourth wall in his monologues, seemingly addressing the player directly rather than the protagonist. After the console is turned off (the only way to exit the game due to lack of menu), the disc may be removed and a different game may be inserted and played normally, at which point the SCP's anomalous effects become apparent. At some point during gameplay, [SCP GAME ANTAGONIST'S NAME HERE]'s armada will appear within the second game's world (cutscenes depicting the event show entry via some kind of wormhole), regardless of the game's original programming, with the intent to conquer it. Gameplay continues as normal, but the focus of the game's plot will shift to fending off this new opponent, regardless of any prior story or antagonists. Of note is that [ANTAGONIST'S NAME HERE] will continue to break the fourth wall, and will also show sentience, memory of previous encounters with the player, and the ability to learn from the player's actions and adapt between game sessions, even if the console in question has been powered down. Both the console and disc in question will be "infected" the SCP, with the game able to spread its effect when used in another console and the latter able to infect other games. Despite the antagonist's expressed desire to "cross into" reality and conquer it much like the worlds of games infected by the SCP, it is unknown whether such threats should be a concern to the Foundation, though use of the SCP on a computer bears a considerable risk of containment breach and/or information leak. "██████ ██ ████" seems to have originated as freeware on a file-sharing site, which was subsequently brought offline by [REDACTED] shortly after discovery of the SCP, though there is considerable possibility of more instances of the SCP existing on the Web or the general public.
TL,DR: bizarre indie game with an infectious sentient fourth-wall-breaking antagonist that conquers the worlds of other games and has an expressed desire to do the same to ours. It is unknown if he can follow up on his threats, but his apparent internet origins mean he could still be out there and pose a considerable threat to information security, especially if he gets into a Foundation computer. Also, don't ever EVER play his disc on a DVD player. Whatever it is that happens when you do that, it doesn't end well.