Apollo 1
Back in the early days of the Apollo programme, my father worked as a service rep for an aerospace company, which had made some of the gauges for the command module. One day dad comes back from a business trip, carrying some burned gauges that he needed to do some analysis on. Dumb, thickheaded kid I was, I was holding these, looking them over, and presumed they were from an airplane (which they also made instrumentation for) and never made the connection. Wasn't until years later my mother said she had 'requested' they be taken out of the house because they were creeping her out (which is when I learned what they were really from).