Professor Jorge Antonio Gutierrez:
Overall, the answer is no. Laughing can increase your intrathoracic pressure, and if you have an aortic aneurysm, that pressure can be transmitted into your vascular system, and it would rupture. But in that case, you just happened to laugh: the laughing didn’t get you. Somebody can have a heart attack while they’re laughing, but they were going to have a heart attack no matter what.
Nothing is so funny it will kill you.