A US couple have been left stunned after receiving an anonymous letter slamming them as "selfish" for raising their boys in a beachside apartment.
Where other children might run around a backyard, Kelly and Mike Bruning's boys, aged two and four, spend their playtime at the beach, dubbed by their mum as the "infinite backyard."
But it turns out there's at least one person who disagrees with the Bruning's living situation, so much so that they felt compelled to pen a letter to them expressing their distaste for the couple's lack of lawn.
"It's important that you know you guys are about the most selfish parents around," the note reads.
"Because you like the beach, your boys are trapped in a tiny, one bedroom upstairs apartment. Kids need a yard to play in."