Regedit Head Trick -

Here, users would create new keys (DWORD values) named "SystemResponsiveness" or "Priority" and set them to high values (often setting the "Priority" to 6 for games). Theoretically, this tells Windows, "Treat my game process as the most important thing on the PC," preventing background tasks from stealing CPU cycles.

When Windows loads, your screen will be completely upside down. Your mouse will move opposite to your hand. Your head will instinctively tilt. Regedit Head Trick

The most common origin of the "Head Trick" stems from a typo. Early Windows NT documentation referenced (computers running without a monitor, keyboard, or mouse). Here, users would create new keys (DWORD values)