If I found a laptop I would:

1. PC... pop out the BIOS battery to clear the BIOS password, re-flash the BIOS, DoD wipe the harddrive and install Windows fresh.

2. Mac... pop out the battery, wipe the PRAM, DoD wipe the harddrive and install OSX fresh.

I miss the old firmware PowerMacs. You could reprogram the firmware to lock the boot sequence with a password. Unlike BIOS the firmware was NVRAM so popping the battery and resetting the PRAM wouldn't change much. The only way to get past the firmware was to replace the motherboard.

'twas a joke bro. If I found a laptop, I'd do everything in my power to return it to its owner.