A posting on Reddit shows a nearly 30-year-old Knicks basketball card with a surprise in its background — the infamous Menendez brothers sitting in the front row.

The courtside curiosity, just to the left of player Mark Jackson in the 1990-91 season “Hoops” brand card, was discovered by user “Pirate-Redbeard,” and went viral after it was tweeted out last week.

“Reddit is mostly bad but the other day I learned on that website that the Menendez Brothers are in the background of this basketball card and that logistically this would be between when they killed their parents and when they were arrested and I cannot stop thinking about it,” tweeted John Rosenberger.

Lyle and Erik Menendez murdered their parents in 1989, but were not considered suspects until 1990, when they were arrested.

They were convicted after a high-profile 1996 trial, during which they claimed to be victims of sexual and emotional abuse.

Jackson spent his first five NBA seasons with the Knicks before going on to play 17 more seasons with seven other teams.