The land is located in southeastern Texas’ Cameron County, and the court document alleges that SpaceX cleared the parcel of vegetation, compacted its soil with gravel to allow its employees to park vehicles on the property, brought in generators to run equipment and lights and is storing “large pieces of construction equipment and numerous construction-related vehicles” there.

“SpaceX has never asked for permission to conduct these activities and has never reached out to CAH to explain or apologize for the damage caused to the property and CAH’s ownership interest therein,” the court document states.

UPI has asked SpaceX for comment.

The property was purchased by Cards Against Humanity as a “prank” or “stunt,” in part with funds from a supporter-funded campaign, in August 2017 amid then-President Donald Trump‘s effort to build a wall along the U.S.-Mexico border.

The company said in the lawsuit that the purchase was to draw attention to “another example of injustice and hubris” by Trump and to live up to the promise Cards Against Humanity made to its supporters to “make it as time-consuming and expensive as possible for Trump to build his wall.”

That property was never used for Trump’s border wall, but in the years after its purchase, plots in its vicinity were bought by SpaceX, which within the last six months has been using the Cards Against Humanity plot as its own, the lawsuit said.

According to a website Cards Against Humanity created to announce the lawsuit, when SpaceX was approached by the game company about its use of the land, the aerospace giant gave them 12 hours to accept what they described as a lowball offer that amounted to less than half of the land’s value.

“We said, ‘Go [expletive] yourself, Elon Musk. We’ll see you in court,'” according to the website.

Cards Against Humanity is suing SpaceX for $15 million, which the company said on social media over the weekend will be split with all 150,000 who paid $15 to help purchase the land seven years ago.