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In Rocky IV (1985), Sylvester Stallone wanted their fight to look as real as possible, so he told Dolph Lundgren to go for it and really hit him. It resulted in Stallone
You May Miss This In Rocky 4 (1985)
Rocky IV' at 35: Sylvester Stallone Was in the ICU After a Dolph Lundgren Punch Actually Connected – The Hollywood Reporter
Was Sylvester Stallone on steroids in Rocky IV? - Quora
Dolph Lundgren Jokes Stallone's Rocky IV Hospitalization Was A Scam
Sylvester Stallone Rocky IV: 'Dolph Lundgren almost killed me, I was in intensive care', Films, Entertainment
Dolph Lundgren Remembers Sylvester Stallone's Hospitalization
Dolph Lundgren finally answers accusation he put Sylvester Stallone in hospital, Films, Entertainment