I now always use my phone as an alarm clock. I have always wondered what happens when the alarm goes off and I am too lazy to switch it off (or when I leave my phone at work by accident). This morning I found out that the phone goes off after 15 minutes, because I was too busy dreaming.
My dream was about time travel and the use of clones or earlier versions as replacement body parts seemed too important to stop. However, in the light of the morning, it seems like a very average idea.