A grieving family and funeral congregation were left horrified when a pornographic video was played during the service.
Hundreds of people gathered at Thornhill Crematorium in Cardiff to pay their respects to Simon Lewis, 33, and Simon Lewis Jnr, who were killed in a collision.
Lewis died in the crash on New Year's Eve on Lamby Way in Cardiff.
Mourners at Wednesday's funeral described their shock after a blunder resulted in porno footage being played, instead of a tribute made in remembrance of Lewis.
Cardiff council, which runs the crematorium, has launched an urgent investigation.
"It was absolutely disgusting. The priest turned around to play the video of Simon, but instead a hardcore pornography video was played," said a mourner.
"It took them nearly four minutes to turn it off. People couldn't believe what they were seeing."
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