I read somewhere on this site that someone else had this happen to them, but now i can not find the posting. I have not had this happen on my MacBook YET, but on my older iMac, it once told me to "simmer down" when I was typing really fast! I thought I was hearing things, until it said it again a few days later, lol! Kind of freaky, yet cool. And just this week, a friend of mine who is a freelance graphic artist was busily working at home on her Mac when she said it suddenly made a sighing sound?! I'm just curious if anyone else has ever had this happen to them? I have been googling and searching online all morning to see if I could find any info on this.