grabbing and moving the main menu card (the A of Balatro); releasing it after moving it away from the center; and grabbing it before it returns to the center, will cause the card to keep moving towards the center while also being controlled by the mouse. This effectively moves the position at where the card was grabbed at, and the mouse will be far away from the card; it also will cause the card to move faster than the mouse if the mouse is moving in the same direction as the card (since the movement of the card back to the center is added to the movement of the mouse; this is intuitive).
Extremely minor bug but when bored and messing with the card in the title screen it feels kind of odd.