yourplayersaidwhat:

A fire elemental appears on the road attacking the party.

Tiefling Barbarian: *goes into a rage that involves setting himself on fire and dealing bonus fire damage*

The rest of the Party: Why would you DO THAT?!

We manage to defeat it somehow despite us all being level 3. The tiefling deals the finishing blow.

DM: *After describing the elemental perishing* You have heard the phrase “fight fire with fire” but you have never actually seen anyone do this and suceed.