The speaker shares his experience of sneaking into an IT shack and discovering stacks of laptops, due to someone accidentally leaving the door open.
A hacker finds the admin password and uses it on all user laptops, then cracks the admin password using a password cracking station.
Using a local admin password can limit access to a computer and potentially give access to multiple devices if used across a company. This presents a security risk that should be addressed to prevent unauthorized access to sensitive data.