Last week David Seah released the Procrastinator’s Clock, a simple clock that runs somewhere between on time and 15 minutes ahead. If you’re the type of person to set your clock 10 minutes ahead, then build that buffer into your plans anyway, it might be worth a look.
Besides being fun, the Procrastinator’s Clock reminds me of a somewhat similar idea I had a year or two ago. Mine was for an alarm clock that would go off randomly some time between on time and an hour early. I still haven’t tried building it yet though…