Costanza building a mini bed under his desk at the Yankee Stadium to sleep during work
Costanza buying the Frogger machine just because he got the high score as a kid and not understanding how batteries and power works
Costanza joining a reading group, straight refusing to read the book, wanting to watch the movie instead, then after finding out that the movie is out of the rental store, illegally obtaining family's address, inviting himself in to watch the movie with strangers, then bossing them around for popcorn, juice (that he wasted) and telling the wife in the family to not talk about her dying mother during the movie:smuggeorge2:
Costanza telling off his boss and quitting his job, going to talk to Jerry, realizing he should not have quit, so he goes back the very next day, pretending like he still worked there, hoping everyone will forget he quit:smuggeorge2: