All the stupid people who didn't meet up with his high expectations. Or put another way, not the brightest bulbs in his new chandelier.
Could you pass his exam for being hired by his laboratory?

https://books.google.com/books?id=PhVDAAAAIAAJ&pg=PA320&lpg=PA320&dq=edison+X+y+z+-trinity&source=bl&ots=stl5R1KouI&sig=ACfU3U3gHVK_Vtj2ItV6Sk8s6qT1sZ-7uQ&hl=en&sa=X&ved=2ahUKEwiJ_Je3m_fsAhVCX60KHUGDCVI4RhDoATAFegQIBxAC#v=onepage&q=edison%20X%20y%20z%20-trinity&f=false

Meanwhile, here's a ZOMBIE VILLAGE chip to look at. NOT from Ziegler's of Stockton!