During a family visit here about twenty years ago we were climbing in single file the steps up the hill when a large male macaque appeared over the border wall and snatched a biscuit from my grandson's hand. My wife jumped forward to protect him and the monkey bit her arm. Before I could react my son-in-law a six foot rugby player had leapt forward and with a rib-crunching kick lofted the beast into the air, over the wall, and crashing into the undergrowth.
My wife had to be treated at a Hua Hin hospital with a course of anti-rabies shots.
Of all the cute monkey species, never trust a macaque or baboon!