We've encouraged DS to play with technology slightly above what other 5yos use, like Excel.
So yesterday he he decided to set up the alarm on Daddy's mobile (which Daddy didn't know existed) to go off at 4:30 AM. An on I can't find the bloody setting to stop it.
This would be sign of both malice and some intelligence, if he's actually checked whether Daddy had bothered to set the clock time. Thus it went off at 2PM, which is good.
A lecture about the trouble Daddy's friends got into for hacking I think is in order.