Contextual studies: Laughter is contagious

Proof that laughter is contagious: http://www.wimp.com/laughtercontagious/

This is what we want to prove in our contextual studies presentation. After lots of discussion we came to the conclusion that people are inclined to laugh over specific points that they find funny for personal reasons when brought up in conversation. I specifically was repetitively made to laugh by a Fawlty Towers reference of how Sybal makes toast in the morning, despite the fact that I had seen the joke numerous times over the years.