Last night I was browsing on YouTube with the missus on the MacBook, just music videos etc. We started getting these odd pop-up messages, like "click here to see me tortured" or "click here - I really am only 10 years old". There were two or three and were quite disturbing. Missus said to click to find out what they were. I said no way, closed down the computer and started it up again. They did not appear again. It was rather worrying. We let the kids use this laptop. WTF was going on?