Are you referring to the SMBC comic?
Max speed, sure. But minimum temperature? It's zero (Kelvin). Of course there's gonna be a minimum, this doesn't belong here.
There are negative temperatures, but I wouldn't characterize them as being "lower than zero kelvin". It would be more accurate to say that negative temperatures are "higher than $\infty$ kelvin".
Maximum temperature, not maximum energy. Negative temperatures are even higher energies.
The real issue here is that T is a dumb unit -- 1/T makes a lot more sense, and when you look at it that way, the trend is just "higher energies have lower 1/T" and passing through zero is entirely unremarkable.