I think it's pent up stress.
I USE to wanna go animal on someone for no reason like I wanted to scream,kick,rip,punch and I didn't know why cuz I'm a really calm quiet person normally
I sometimes feel like punching some dickhead's (someone being reallyrude or stupid) face in.... but then think of the consequences and don't do it. So, yeah, normal if they get on your nerves.