Flare-up
Part of speech: noun
Definition: A sudden outbreak, outburst or eruption (originally of flame, but now used more generally of any violent activity) A sudden intensification in activity
Outburst
Part of speech: noun
Definition: a sudden, violent expression of emotion or activity
Example sentence: It's a treat to portray a complex character. Besides... where else could I find a job where emotional outbursts and odd exclamations like 'Egad!', 'Narf!', 'Poit!', 'Splonk!' and 'Zort!' are allowed?