If you must resign, resign honourably. Curse all you want,calm down and write a good one-It strikes deep. Resigning like this serves to make your boss happy and consider you a good riddance.

Keep your friends close and your enemies closer.Sio lazima punda astep on mizigo.Step out with your head held up high and smiling,add some swag and buy him a thank you for all the frustrations you have endured cake if you can. It will haunt him/her for a short while. And you will feel good about yourself.

ukweli it doesn't hurt to have some courtesy - when I was still young I one day went to the hr nikaongea mbaya and dared him to fire me - shock on me the guy sprint out of the office to the ceo and came back waving a check, a termination letter and a wide grin on his face, and the rest is history. as Varoufakis said

There is a story told of a Kisii guy who used to work for a tea farm as a tea picker in Kericho. In those vast tea estates the workers are given a one roomed house. After not getting along with his boss the guy was fired. He took all his belongings and tied them up into a bundle that he could place on his head. Now in those tea estates there are no matatus and it is quite a distance of walking before you get to the main road to catch a matatu. The guy got his bundle of luggage outside and he was ready to go but then a wave of anger crossed his mind again "gaki yaani hawa jamaa wanaweza nifanya madharau hivi!!?" He wondered how he could best hit back and that is when a thought occurred to him. He went back into his now empty one roomed house and right in the middle of the room he unloaded a big mountain of feaces. After relieving himself he indeed felt better. He got up looked at his little fresh still smoking shit sitting right in the middle of the room and he smiled at himself as he went and made sure he closed the two windows and then went out and closed the door. The thought of the smell that would hit his supervisor when he came to open that door made him very happy indeed. He put his little mzigo on his head and started the walk to the main road. After he had walked for about 5 minutes it started to rain. In those areas when it rains, it comes down hard, it is cold and the ground is slippery and muddy. Because he had another 30 minutes to go the logical thing would have been to go back and wait until the rain stopped but when he remembered what he had done he just kept on walking in the freezing rain that now wiped out his smile of victory. As @Wamunyota says, kiraro gitimiagwo.

Good one. Better to die on your feet than live on your knees.