Laughing in Public- fou rire

So I was reading a book at the dentist office while waiting. The dentist office is a… not so funny place. Everyone looks nervous and anxious, but here I was reading and well… it was funny.

Not done it yet, but enjoying it so far...
I guess it's my type of humour

I tried to muffle a laugh, but dang it, it was FUNNY!

And my quiet throat-giggle turned into a snort. Which is always funn--ier.

So there I was giggling like a nut. I glanced up. Everyone was trying not to look at me, but when someone snort-laughs all to themselves at the dentist office, it’s grounds for a few smirks. So everyone had this little grin they couldn’t really hide while they avoided making eye contact with anyone.

I had this urge to read them the page that made me laugh so they’d know I was not as crazy as I was coming off, but I did that before and no one else thought it was funny, so then I really did look crazy and even got that eye-roll thing that makes me want to run.

Looking at the cover of the book, well it looks serious so they probably thought I was a bit of a weirdo. I had no idea it was going to be so funny, but this kid. *shakes head and wipes laughing tears that materialize* Anyway,  I was tempted to tell these strangers it was a good book, but they were trying so hard NOT to look at me I decided to just sit there and giggle to myself. But it's hard to do this properly and without drawing attention to yourself. At one point my entire body was shaking with the laughter which of course was funny and you see how this was not cool.

In French we call it fou rire and I never found an expression similar in English, but this is the perfect example, just laughter that explodes from inside you at the worst time or place that you can't get a handle on. 

So, I finally collected myself and dived back into the book. Well… it got more funny… so there I was, right out laughing to myself, not caring where I was. I mean, let's face it, by now I was already on the nutso list, I might as well just go with it.

No one else laughed, just stared ahead pretending I wasn't nuts. I know right?

What do you do when you’re in public and can’t stop laughing? This ever happen to you? Do you ignore strangers laughing or get in on the joke? Where is the weirdest place you ever caught the fou rire?