Back in 2010, Youtuber max1morgan2 filmed door to door Advantage Wonder Cleaner salesman Kenny Brooks in full wisecracking, rapid-fire pitch mode.
The video went viral at the time. His hilarious monologue was even transcribed for posterity. A guest spot on Ellen seemed assured, but Kenny disappeared, prompting all manner of conspiracy theories including (subsequently disproved) rumours of his death.
To this day, no one seems to know what happened to him.