In our current understanding of physics, absolute zero, which is 0 Kelvin or -273.15 degrees Celsius, is considered the lowest possible temperature in the universe. At this temperature, all molecular motion theoretically ceases, and a system possesses the least possible energy.
If the hypothetical situation you described were to occur, where the temperature suddenly dropped to a negative value such as -105 Kelvin, it would imply a violation of our current understanding of thermodynamics and the laws of physics. Negative temperatures, in particular, would represent a state of higher energy compared to positive temperatures.
In the context of temperature, negative values are defined using an unconventional temperature scale called the "Kelvin scale with a negative sign." Negative temperatures do not indicate temperatures below absolute zero but rather represent systems that possess more energy than systems at positive temperatures. These systems exhibit peculiar behaviors, such as higher entropy with increasing energy, which is the opposite of what we observe at positive temperatures.
However, it's important to note that achieving negative temperatures, especially in the macroscopic scale, is highly unlikely with our current knowledge and technological capabilities. The concept of negative temperatures is typically encountered in highly specialized systems, such as certain atomic and molecular systems with specific energy configurations.
In summary, if the lowest possible temperature suddenly dropped to a negative value like -105 Kelvin, it would defy our understanding of physics as negative temperatures represent a state of higher energy, contrary to the behavior of systems at positive temperatures.