Now the funny thing is that Sarah Brosnan, who's been doing this with chimpanzees, had a couple of combinations of chimpanzees where, indeed, the one who would get the grape would refuse the grape until the other guy also got a grape.
Vtipné je na tom, že Sarah Brosnan, která toto zkouší na šimpanzech, měla několik dvojic šimpanzů, ve kterých opravdu ten, co dostával hrozny, odmítal, dokud ten druhý nedostal taky.