Good Intentions is a flash screamer from 2004, originally appearing on Albino Blacksheep on March 31st, 2003, it was created by Spudnewt (Marilo Rektorik), it was added on the same date when the "Prank" portal was added to AB.
The flash animation pretends to be just a slide show of very pretty, peaceful photos, with R.E.M.'s song Shiny Happy People playing in the background. The slideshow starts out with some pictures of flower beds and tree blossoms, as well as a dolphin during the intro, and then switches to various photos of people in a happy mood. Afterwards, a photo of Abdulah al-Basri's face zooms in very slowly and then suddenly switches to a picture of the same man doing a grimace with his eyes popped out, while a pair of Fatal Frame images (one from Kikia and one slightly different from the former) pops up over it with a loud scream.
It's not over yet, because after the aforementioned images, it starts doing the complete opposite, showing scary and unpleasant red-toned pictures as Zan by Dir En Grey plays. The pictures include a corpse being stabbed in the head with an axe, a shot of the painting "The Sea Monster" by Theodor Kittelsen, a photo of Anton LaVey (founder of the Church of Satan) in front of a pentagram, Gary "Stretch" Turner stretching his face with metal clamps, and a man wearing Joker makeup. It then appears to be over, but after a short time, the screamer part from earlier will pop up again with the same scream from before, before the animation ends for real.
NOTE: The following animation contains a screamer!