I can say with certainty I have written and drawn more variations of this gag than any other. The only rival might be Janis’ neurotic insecurities in the couple’s early marriage, i.e., in the early years of the strip. Even then, the writing was more on a topic and did not always involve rewriting the same joke. And her insecurities eventually faded. Come to think of it, I don’t do as may “oblivious Arlo” jokes these days, but that’s only because there have been so many. Having said that, it is telling that these strips constitute part of the bedrock of Arlo & Janis. They’re popular, one of those “looking in our window” moments. Couples appreciate them. They show them to one another, smile at themselves and clip them or print them to display on the refrigerator. It’s hard to argue with that.