Friday morning my boss came up to me while I was at my desk speaking to another person and asked me if I had finished writing some sections of the works approval. He then asked when it would be done. He was angry and asking me in a demanding threatening tone, so I was stunned and eventually said I was going to do it on the weekend.
Look up "narcissistic personality disorder" and see if it applies to your boss. You may find ideas for techniques to help deal with him.