Went to a place yesterday which is where monkeys roam free in a forest. You can walk amongst them as long as you don't approach.
Before you go in, you're told not to scream, yell or startle them in any way.
Everyone wandering quietly when one monkey swings over our heads on a tree branch and some woman HAS to go "WAAAAAAA!" even though it was metres away.
WHY!
All the monkeys were terrified and ran off. Poor things.
They came back again after a bit but really?