As a kid, I owned several Family Circus books. In the mid 1970s cartoonist Bil Keane added a few imaginary characters to his comic strip, the imaginary gremlins “Not Me” and “Ida Know!” These gremlins took the blame for many accidents around the Keane household.
“Who broke this vase?” “Not Me!”
“Who tracked mud all over the floor?” “Ida Know!”
In later years, additional gremlins (“Nobody,” “O. Yeah!,” and “Just B. Cause”) were also added.
Family Circus has faced a lot of backlash over the years (specifically since the advent of the Internet), but I can tell you that as a child, there were a lot of incidents in our house that were attributed to “Not Me” and “Ida Know”.