That one time a fatty indirectly gave me an std I was at a packed restaurant that had long tables with benches outside. Two planets got up to leave and I sat down and hung my arm over the backrest. The next morning I noticed weird red spots in the crook of my elbow. By the time I got myself to the doctor the spots had migrated to my midsection. It was scabies. Different spin: Brave pioneers left their home planet in search of new habitable worlds. They quickly found a potential new home that had way less mass and way lower gravity than their original home. As the landing site was too exposed they set out to find shelter and started to dig homes for fear of being flung into outer space. In an unexpected twist the new home world had something against being invaded by aliens and fought back with chemical warfare. Everybody died.