to go postal (on)
The boss went postal today. Completely crazy, yelling and throwing things.
If you don't shut your trap/mouth, I am going to go postal on you!
(I love this! In the USA, postal workers have a reputation of going crazy and becoming weapons of mass destruction.)
to go medieval (on)
Don't go medieval on me, woman! I hardly know her.
(I first heard this in the film "Pulp Fiction".)
to go bananas, ape, bonkers, crackers, off
I hate this job! One more stupid customer today and I am going to go bonkers!
She went off on me. I still don't know why she was so angry.
to blow someone's stack
Don't blow your stack! It's not my fault.
(stack = the chimneys or "funnels" on a ship. When a steamboat blows its stack, the boat often sinks.)
to kittens, to have a kitten
Don't have kittens! I didn't do a good job but I'll do it over again.
to go on the warpath
His girlfriend went on the warpath when she did not get flowers on Valentine's Day.
("Warpath" = used to mean a tribe is at war)
to raise cane. A ruckus
The boss raised cane when I arrived late at the office.
Fred is always making a ruckus about something.
(Can also mean "to complain" and "to make noise")
to lose one's cool
When he did not pay me the money, I lost my cool.
(one's cool = one's relaxed, pleasant demeanor)