Gifts that force recipient to spend lots of money?

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Background: My folks bought my son a freestanding basketball goal. I do not want it in front of my house because… reasons. Instead, in order to let my son enjoy his gift, I have to spend thousands on building an asphalt half-court.

Today is their anniversary, and my day for revenge.

What gift can I get them that will cost them many, many times more than what I spend?

Ground rules:

  • No animals
  • No gift cards/certificates