In a fightin' mood?  You can enter the fray or take part in this noisy disturbance, from the Italian for "to smash"
[DOC] [TLE] A plane full of Indians behaving badly | Fetzthechemist's Weblog [PAR] Apr 8, 2012 ... Once again, if one bumps into you (aisle seats are terrible for this .... asked them 
to spare me as I didn't want to ruin my positive mood.