Last Saturday I watched "Mad About You" and the episode revolved around Paul, the main character, getting ride of an apartment he was holding on to and currently subletting to someone. He decided that he would get rid of it in order to make his wife happy. So he goes over to talk to his tenant and its none other than KRAMER!! So Kramer has been subletting Paul Reiser's apartment the whole time. Anyway, at one point Paul asks Kramer how "that guy across the hall, what's his name" is doing.
Anyway, it was really funny, especially with Kramer. I wonder if they're going to tie the two shows together more, with characters visiting each other on their shows.
-Helen