Laughter
![Pier Paquette in Iris the Happy Professor (1992)](https://m.media-amazon.com/images/M/MV5BMTA4MzY5NDcyOTJeQTJeQWpwZ15BbWU4MDA1NjAwMTMx._V1_QL75_UY281_CR93,0,190,281_.jpg)
It seems like the more Professor Iris and the gang laugh, the more they want to laugh. It's contagious. Why are they laughing? There are all sorts of reasons.It seems like the more Professor Iris and the gang laugh, the more they want to laugh. It's contagious. Why are they laughing? There are all sorts of reasons.It seems like the more Professor Iris and the gang laugh, the more they want to laugh. It's contagious. Why are they laughing? There are all sorts of reasons.