Haha, not a problem with a desktop :P

I used to change the settings in the power to stop the power button on my tower from shutting the computer down. When my son was a toddler, he loved to press buttons and the fact my computer button was illuminated was just too tempting for him. I kept getting annoyed at him and then eventually I just changed the setting.

Something else that's very important if leaving a computer running unattended for any length of time is an overall system backup as well as good security settings (firewall, antivirus, antimalware especially). That way the computer is less likely to be affected by malicious software should it be attacked.