Uncontrollable Laughter

Just what makes us burst into uncontrollable laughter?

I came across this You Tube clip by accident tonight
Just imagine sitting in the interview chair and losing it like this!

I could watch it a thousand times and still laugh, even though I do not speak any Dutch and my first viewing was a version without sub titles. I laughed even though I felt very sorry for the interviewees.

Upon closer examination I found another version which explains that the interviewer actually lost his TV career that night.



And another example - this time and American lady newsreader has to leave the set.
Why do they lose it?



The subject matter on the first example was so serious. I guess it was the first chap's high pitched voice followed by the second chap's low pitch voice. But he was in hysterics long before the second chap stated talking.