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-=- Have you tried holding out by not doing anything else for him or with him
  until he picks it up? -=- 

-=-When you're out in public do you pick up other people's trash and comment
  how nice it is when people put their trash in trash cans?   Could you get
  to help you pick trash up in a park or somewhere?-=-

Some really good suggestions, thanks! 

To answer your other questions: This behavior is not new.  I slapped his hand
three times in his life around the stove  (all before the age of three)


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