I once got fired because i upgraded a company's wifi network from a single apple wifi bridge (the residential one!) to a managed linksys or netgear deployment, and there was a bug in the firmware. I don't recall the bug, but it made the chief lawyer's apple laptop drop connectivity to their printer or something a few times the first day. I opened a support ticket, and got confirmation of the bug - at around 8PM, forwarded the email to my boss, and was fired the next afternoon.

what a crap company. They folded within 4 months IIRC, and listed me as the "financial contact" for the fiber optic internet links - got a bunch of nasty phone calls later in the year about needing to pay 5 digits in billing arrears!