boilover

Etymology
.

Noun

 * 1) A hazardous situation where an attempt is made to extinguish semi-enclosed oil- or petrochemical-fuelled fire with water, generating steam which propels the burning fuel outwards.
 * 2)  A sporting event with an unexpected outcome, especially a horse race where the favourite fails to win.
 * 3) * 1953, Pastoralists' Review (volume 63, issues 7-12, page 716)
 * there was not much good horsemanship. The Derby itself was an ordinary race, something of a boilover for Dark Star