All you need is
1 piece of card board
2 coffee mug
3 unsuspecting person
 
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Step 1: Observation

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Try to figure out when the person leaves his/her desk and comes back this may be helpful in the future.

mworrall says: Nov 10, 2011. 10:54 PM
Nasty
nisoe says: Aug 7, 2011. 1:48 AM
evil
nerd12 in reply to nisoeOct 6, 2011. 8:47 PM
PURE evil
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