My grandfather had records of Mack and Moran, blackface comedians who called themselves the Two Black Crows. There are only two bits I remember, and I suspect it was from "The Two Black Crows in Hades".
There was a routine where one said something like - "I'll meet you on the corner. If I get there first I will put a blue spot, and if you get there first, you can rub it out."
The other bit I remember was one of them saying "If I never see you again, it will be ever so much too soon!"