Don't shake the tree when the pears fall off themselves.

Related:

• Shake your family tree and watch the nuts
  fall .....
• When the tree is fallen [down],
  every man goes to it with his hatchet. --...
• When you see a palm tree, the palm tree has seen you.
  African(Wolof)...
• You should go to a pear-tree for pears, not to an elm.
  Publius Syrus (42 BC) -- Maxim...
• When the blind lead the blind they will both fall over the cliff.
  Chinese...
• You may as well expect pears from an elm. -- Miguel de Cervantes (1547-1616) -
  Don Quixote, Part ii, Book iv, Chap....
• Isaac Newton falls off the tree] Cho-Cho: Did the fall hurt you?
  Newton: It wasn't the fall; it was the sudden stop...