... i think it also depends with which hand you use something first! ... as example ... i use the knife always in the left hand while i have the fork in my right hand ... when i eat only with one fork without the knife ... then i have the fork in my left hand ....
or ... the joystick ... the first time that i got to know the joystick was with a C64 ... and the joysticks at that time were always (or the most ... ) syncronous ... i mean, it did not matter if you used it in the right hand or in the left hand ... so i got used to take it in my left hand ... and now i can''t control the joystick exactly in my right hand ...
... but as i firstly saw a computer-mouse ... i took it in my right hand ... because all others had done it too ...
... and now i can use it better with the right hand than with the left hand .... 
