Flim to Flam:
Oops.
It was a simple mistake, really. The coolant looked just like the liquid mana fuel, and was stored in a similar jug. Yes, they were clearly labeled, and Flim knew which was which, but in his haste, he grabbed the wrong one to pour into their latest machine.
When he flipped the switch, it ran fine for a minute as the liquid mana did work as a coolent. However, the moment it reached the critical temperature...
There was no warning.