Final answer:
The patient likely experienced a seizure, as indicated by the friends' description of shaking and the subsequent unresponsiveness, along with a laceration to the lip, which is consistent with injuries that can occur during a seizure.
Step-by-step explanation:
The patient who was unresponsive on the floor and whose friends said he "started shaking a lot, then passed out," likely experienced a seizure. A seizure can cause a person to become unresponsive and have convulsions or shaking movements. The description provided by the patient's friends and the presence of a laceration to the lip are consistent with this diagnosis, as the lip injury could have occurred during the muscular convulsions characteristic of a seizure.
A heart attack typically presents with chest pain or discomfort, shortness of breath, and possibly other symptoms such as nausea, but not with the convulsive shaking described. Diabetic coma could lead to unconsciousness but is generally not associated with convulsive movements. Panic attacks may cause overwhelming feelings of fear or discomfort and symptoms like rapid heart rate and shortness of breath, but do not lead to loss of consciousness and convulsive movements.