Euell Gibbons
Any episode of "The Tonight Show" that originally aired before December 29, 1975 is guaranteed to contain at least one reference to Euell Gibbons. It's usually some sort of gag involving Euell eating a chair or some other non-food item. The crowd rarely erupts in laughter. I imagine even less people laugh now.
https://en.wikipedia.org/wiki/Euell_Gibbons