These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Seinfeld Is Unfunny: When Bugs Bunny first said, "What's up, Doc?" here, it was a shock in ways modern audiences simply can't imagine or appreciate. In 1940, audiences saw the hunter (Elmer Fudd, of course), heard the hunter say he was hunting wabbits (er, rabbits), and then they saw the rabbit. 1940 audiences were expecting that rabbit to scream, run, pick a fight, play dead, anything except strike up a casual conversation with the guy trying to kill him. So, when Bugs did that, he brought the house down - a response that led to it becoming his Catch Phrase. Nowadays, not only does nobody find, "What's up, Doc?" funny, most people don't even realize it was ever supposed to be funny in the first place. It's just that thing Bugs always says in every freakin cartoon he's in.