Do you not see the problem
its a loving magnet
magnets+computers=bad time
Its not ok to keep random stuff on your desk that has the potential to royally forget over your computer.
I am aware of what magnets do to computers.
Basically everything has the potential to forget up your computer, just some more than others.
On my desk I have: (not counting the obvious such as headphones) 3 knifes, a machete, 2 iPods, iPod charger, old student ID, flashdrive, electrical tape, pencils, pen, empty bottles/cans, house key, random change, various plastic parts, a CD, my shaving razor,a lighter ,and a load of coke can tabs.
Sometimes I have a full water bottle on the desk if my 'table' is full and can't hold it. If you're careful than you'll be fine regardless whats on your desk.
Unless its like, a ticking time bomb or something. In that case you're forgeted regardless.