Hell if I know.
That sinking feeling...
Doctor responds: "Heavy drug use, ma'am" Widow: "But doctor, my husband didn't use drugs!" Doctor: "I know, but I did"
Someone who shows up to your door for no reason.
The Final Solution
The Nobel Prize in Genetics.
Poached.
HellIfIknow
Because whenever one started up, the big blades would go "wop...wop... wop" and the little blades would go "guineaguineaguinea".