Laughing is Contagious

I went out with a friend of mine on Saturday and hanged out. This was the first time we actually spent time together as usually its just Hi and Bye.
We started laughing so much that all the people around us also started laughing. Its wierd that laugh can be so contageous...
Feel good that i could laugh for 5 hours straight..... My jaw muscles hurt but whose complaining.
I so Feel me ... Happy for myself and thanks to my friend who helped me laugh.