Harvest Power leaking from your Microwave Oven
This deserves an IgNobel Prize.
Japanese Engineers harvest 1 mW (That is right One Whole Milliwatt) from outside a working microwave:
<a href="https://gizmodo.com/other-kitchen-devices-can-harness-power-from-your-micro-1356914791" target="_blank" rel="nofollow noopener noreferrer">Other Kitchen Devices Can Harness Power from Your Microwave</a>
CEan of the universe, no less.