Cell phone alarm helps announce transition times
We all know that having something other than Mom or Dad dictating times and terms can often be helpful ("When the big hand on the clock hits 8 it will be time for your bath...") but what you may not realize is that you probably carry a tool around all the time that can help you set up these scenarios: your cell phone. Most cell phones have alarm clocks in them. So, next time you're at the playground and your child doesn't want to go home, tell your child you will set the alarm clock on your cell phone for 5 minutes and then it will be time to go.
The friend who told me this hack said it worked like a charm the first time, but that subsequents nights there were requests for "no phone, Daddy." Your milemage may vary.