Can anybody explain this joke to me?
https://www.youtube.com/watch?v=KKMySFWrgHU
>>87411341
So part of it was obviously visual since it was in front of an audience. But IBM cards were punch cards like pic related.
You would put them into a card slot on a computer and the computer would acquire data from the holes. What Lily Tomlin has done here is teach the audience how to make their IBM punch card invalid and perhaps cheat their way out of paying their phone bill for a month.