Ha, Ha, Ha, He, He, He!
I think I've got just about enough self control now for when I'm in public - like at work on the bus - but I really find it doesn't take much to start me giggling.
Once I start I can't stop!
I was notorious for at high school - was set out of class a few times cos I couldn't keep it under control - but from what I've read apparently having a good laugh is actually good for you according to lot of mental health experts.
It's nice to know I'm not alone with this.