The Video Assistant Referee review system has already been the cause of much comment and controversy so far in the World Cup, but until Wednesday nobody knew it could also pose a health risk.
Iran coach Carlos Queiroz complained about a VAR-assisted decision which saw what would have been an equalizing goal correctly ruled out for offside in his side's 1-0 defeat against Spain.
As well as being furious over the disallowed goal, Queiroz also revealed that one of the members of the Iran press office, Mohsen Mogamedkia, needed hospital treatment following the decision.
"We are worried because a member of our staff suffered health problems following the Video Referee's decision. He had to go to hospital and we hope that he is alright," said Queiroz.
After being removed from the stadium in Kazan and checked over in hospital, Mogamedkia was able to rejoin the rest of the Iran team later that evening.
But be warned - although it may help the referee make the right decision, VAR can be bad for your health.
