you wake up, the sun is warm, the sky is blue, the birds are singing.... and suddenly one event comes and ruins everything! :(
for example. breakfast. you are happy covering a toast with butter or jam. and it suddenly slips from your hand and lands in your pants or shirt (obviously) with the side of the jam down! 
you take your cup of coffee and your finger gets trapped in the handle. you try to get out of there but you can´t do it gently. so you start to freak out until all the hot coffee drops on you and you get a 2nd grade burn! 
you go to school/work and you´re late because of the previous. so you run to catch the bus. you get to the corner and there it goes. forget it, you´re late! 
suddenly a second bus appears, so you think you haven´t been so unlucky after all. you cross the street to catch it and at the moment you´re going on the bus you stumble and clean the street with your face. 
those are real stories that happened to real people i know. 
what could transform MY day? obviously, anything of that. but especially the small things. sometimes objects falls from my hands.... one, two, three times in a row! that could freak me out. usually i kick the object into the wall to express my angry. another thing could be when i drop a bottle of anything on the table. i get so mad that my only reaction is to watch the liquid fall from its recipient as i scream "you want to spill? then spill!" 
so, tell us. in your case what things turn a great day into a shite day? 
I was wearing khakis, which are notoriously bad for not drying quick enough, so I had to grab a little "school schedule" note that's always lying around on tables in various parts of the college to cover me until I could get to the nearest mens room (the very same I had just left and was on my way to the lunch room when I noticed the stain) and dry and force it dry with toilet paper. 
though we can't even allow ourselves to get involved with anything that appears like road rage.
