Power jacks in public places can be dangerous. Learn how to protect yourself against "juice jacking".
In the interest of brevity, I won’t bother to go into deep detail about the two latest PC threats that have been discovered. Feel free to google “spectre” or “meltdown” and you can read for hours on the subject. Suffice it to say, these two exploits are actually 20+ year old vulnerabilities in the actual processors of computers, phones and other devices.