There are actual negative temperatures (Kelvin scale!). One example are lasers in which a population inversion facilitates lasing. https://en.wikipedia.org/wik

There are actual negative temperatures (Kelvin scale!). One example are lasers in which a population inversion facilitates lasing. https://en.wikipedia.org/wiki/Laser https://en.wikipedia.org/wiki/Laser https://en.wikipedia.org/wiki/Population_inversion https://en.wikipedia.org/wiki/Population_inversion https://en.wikipedia.org/wiki/Negative_temperature#Lasers https://en.wikipedia.org/wiki/Negative_temperature#Lasers (Negative thermodynamic temperature has very unintuitive effects in general, so maybe read all of the last article to get an idea)