In an interview, Sylvester Stallone recounted how he nearly died while filming Rocky IV.
Stallone asked Dolph Lundgren to punch him for real during their final fight scene in the ring.
At one point, Lundgren delivered a crushing blow to Stallone's chest, sending him off the set and straight to the hospital, where he was diagnosed with a heart tumor and his blood pressure was recorded at 260 mmHg.