laugh attacks where I can't breathe or stop the tears

...I had another one today with my mom! Now I know where I get this odd phenomenon from. My mom was trying to recount a "funny" story about a family friend who had an encounter in China where he got accidentally spit on from a guy who was walking closely in front of him (the guy didn't notice him when he turned around. the spit hit his face!) and our family friend's reaction was to sucker punch him. Well, my mom hadn't even started the story yet - she just warned me that it would be funny and that I should get finish chewing the watermelon in my mouth - and suddenly we both burst into hysterical laughter and tears! And my dad was just like, going about his cleaning, all suave and nonchalantly, while my mom and I couldn't breathe or see :D

Well after about ten minutes, she managed to get the story out in between giggles and I have released enough from my tear ducts to last the rest of this year!