We notice, looking at all these people opening boxes, that when people get to about 13 out of 15 pies, their perception shifts, they start to get a bit bored, a bit testy.
Notamos, olhando toda essa gente abrindo caixas, que, quando as pessoas pegam cerca de 13 das 15 tortas, suas percepções mudam, começam a ficar aborrecidas, irritadas.