Yesterday I watched one of these animated pictures which cause seizures (mostly on people with epilepsy), for no more than 3 seconds, and I crashed. Have you experienced this? If you haven't, please don't try it. I was looking at a random profile on facebook and one of the posts was this picture. It had text over it "You can thank me for the seizure later" but I didn't pay attention and clicked on it. It took exactly 3 seconds of watching and I crashed. It was meant to be a joke obviously, but it's a joke for healthy people, which only get a short time headache from these pics. Lesson learned.