We're not sure what you remember from your own science lessons back in the day, but ours mainly seemed to involve Bunsen burners and some awkward moments in sex education classes.
There was certainly nothing like this dramatic moment from a physics lesson at the University of Nottingham.
It shows what happens when you pour boiling water on to liquid nitrogen.
It's so impressive that the videos below posted on Reddit have been viewed nearly one million times.
Commenting in a university blog on the videos - which were taken by students during a lesson earlier this month - Dr Meghan Gray said: "Second year Thermal & Statistical Physics….phase transitions….sound dull?
"Not if your lecturer is Dr. Yong Mao and you get to witness demonstrations cooked up by lab technicians Paul Munday and Denise Watt.
Dr Gray, an Associate Professor in the School of Physics and Astronomy, added an 'obligatory safety note' saying: "One of the byproducts of combining water and liquid nitrogen is a whole lot of nitrogen gas – which of course will cause problems if it displaces the much needed oxygen in an enclosed space.
"Viewers can be reassured that the lecture theatre is well ventilated, and this demonstration (as with all the demos we do) was risk assessed and safety approved, including calculations on oxygen depletion verified by meter readings in front of a selected panel.
"No student was harmed in the making of this video!"
