Steak 'n' Shake is called Mistake 'n' Shake.
McDonald's has a bunch of names. Some kid in grade school called it McDoodle's. I sometimes call it Ron McDon, because one time in gym class in grade school, there was some kid named Ron who annoyed some other kid, causing him to say, "Stop it, Ron McDon!"
In my youth, I used to have a lot of parodies for commercial slogans that I came up with after hearing them for the first time. Here's some of them...
Campbell's: "Soup is good food" became "Poop is good food."
U.S. Army: "Be all that you can be" became "Pee all that you can pee."
NAPA: "All the right parts in all the right places" became "All the right farts in all the right faces."
Holiday Inn: "#1 in people pleasin'" became "#1 in people peein'."
Kroger: "Cut your cost at Kroger" became "Cut a fart at Kroger."
Bubble Yum: "Keeps it poppin'" became "Keeps it poopin'".
There was also a commersh for Pizza Quick Sauce where they sang, "Open a jar of Pizza Quick Sauce and open your own pizzeria." I always used to sing, "Open your own diarrhea."