Remove a Stripped Screw That's Flush With the Surface by Hammering In a Larger Bit
When a screw's head is too stripped for its own driver to grip and it's sitting flush with no room to pry, hammer the next size up bit (a T25 for a stripped T20, for example) straight into the stripped head. The impact cuts fresh grooves the larger bit can grip, and the drill backs it out from there.