LittleBigPlanet level. A PSN user named Upsilandre, whose brain is at least thrice the size of ours, has created an "electronic" (i.e. not mechanical) 8-bit calculator capable of adding and subtracting any double-digit number. In the video after the break, you see both how to interact with the level and how the whole thing works (spoiler: It's nearly maxes out the complexity meter). It's a shame to think this might disappear once the beta is over.
As for the other video -- and please don't let this take away from your awe at the above calculator -- file this under the "unfortunate but bound to happen" category. A couple levels have popped up on the beta based on the September 11 attacks. Remember, folks, you can report offensive levels in-game for Media Molecule to promptly slam. GoodEvilPlanet officially launches October 21.
[Thanks to everyone who sent these in]