My main memory of Wimpy is the time I went in our local one with my mother. There was a tramp sitting asleep at the table nearest the door with an empty cup of coffee. After a while, he suddenly woke, rushed outside and threw up in full view of the customers inside. Lovely!
My other main memory of them was they served the best ice cream in the world.
Well at least the tramp had the presence of mind to go outside. Could've done it right where he sat.
Do you mean the plain white ice cream (which is what I think was perched atop the aforementioned Brown Derby)? I did like that.