At one point in "Whatever Happened to Shorty Twang?", Sylvester accidentally hurts Tweety. He is quick to sincerely ask Tweety Bird if he's alright.
The Grand Finale "This is the End" has Sylvester appear to finally eat Tweety Bird, eventually resulting in the show getting cancelled. After it's revealed that the episode's events were All Just a Dream, the first thing Sylvester does upon finding out that Tweety is still alive is to hug him and tell him how much he loves him.
Hephaestus and his wife Aphrodite reconciling their differences in "Keep Your Pantheon".