(thing) by /dev/joe Fri Mar 30 2001 at 12:18:55

Answer to old chestnut: move 2 matches to flip the glass: 

|   |
| O |
|___|
  |
  |
  |
To flip the glass, move the horizontal match to the right by half its length, and move one of the walls of the glass: 
    |
  O |
   _|_
  |   |
  |   |
  |   |
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