Bombardier beetles who shoot boiling chemicals at predators by having internal explosions from mixing 2 chemicals.
BBC Earth / Youtube, Tiny Fox Lab

The Bombardier Beetle that can combine hydroquinone and hydrogen peroxide in its abdomen to eject a hot, noxious chemical spray that can kill attacking insects. – Tiny Fox Lab Facts

Preview photo credit: BBC Earth / Youtube
Source: en.wikipedia.org/wiki/B…