What moment from an experiment SHOULD have been used as the Stinger?
For me? Being From Another Planet (1982) currently uses the ridiculous scream of the bureaucrat recoiling as his hand is eaten alive by alien mold. My replacement would be earlier where a nurse shrieks as she x-rays a woman and it cuts to an incoming nurse then settling on the now dead woman with rot on half her face. A touch more subtle while just as silly.