I know that that is like to get things knocked off from you.
Few years back, one night I won the door prise for an Acer N10 PDA. 2 weeks later I had it knocked off by some one walking into the office "looking for work"
Few years back, one night I won the door prise for an Acer N10 PDA. 2 weeks later I had it knocked off by some one walking into the office "looking for work"