Bus timing errors! Fun times! Forgot a wait state? It'll probably work, on most chips! Even better when suppliers fix, or add, bugs and don't tell you. Or cha

Bus timing errors! Fun times! Forgot a wait state? It'll probably work, on most chips! Even better when suppliers fix, or add, bugs and don't tell you. Or change the firmware they are shipping on a part that's hanging off a UART. Or how about discovering that in the 21st century, one of your suppliers doesn't use source control for their firmware and every time they send you over a firmware blob it consists of some patches applied to whatever code happened to be laying around on some developer's machine!