If you let everyone walk over you, you become a carpet.

Related:

• If you pull the wings off a fly,
  does it become a walk...
• If you can't go over, you must go under.
  Jewish...
• What you give you get, ten times over.
  Yoruba...
• Don't salt other people's food. --
  Bulgarian...
• Let no man deceive you with vain words.
  Biblical...
• When you live next to the cemetary,
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• Marge: Homer, did you just call everyone "chicken"?
  Homer: Noooo. I swear on this Bible! Marge: That's...
• You Threw Up on the Carpet of My Love. --
  Lewis...
• Bart: Chapter 8; Let's talk zombies. If a zombie bites you,
  you'll become a zombie. You must walk the earth...