Hulk's interactions with the phone during Reptil's debut episode. And that ending.
Hulk: Riiiing! (cut to a shot of Super Hero City) RIIIIING! (cut to a shot of the Earth)RIIIIIIIING!!!!!
And in "This Silver, This Surfer":
Wolverine: He is weird. Falcon: Says the guy who smells like a squirrel and has built in machetes.
And this in episode 5:
Dr. Strange: No, Falcon, leave the magic to the Sorcerer Supreme! Thor: David Copperfield?
Just about anything the Hulk does.
Hulk: *throws a potted plant out the window* Now plant will get plenty of sun!
When Skurge the Executioner freezes Valkyrie solid while she is cooking, Thor shouts that Asgardian meatballs taste disgusting if they are frozen, then defrosted. Skurge mocks him for thinking about food instead of acting concerned for her well-being. Later, when Valkyrie is freed, she also tears into Skurge for ruining the meatballs.
In "Stranger From a Savage Land", Iron Man calls Captain America for backup. Captain America's enthusiasm is priceless.
Iron Man: We need you and your little shield to take a ride on a giant pterodactyl.
Captain America: *looks at Iron Man suspiciously, then grins* Sir, yes sir! No jibber-jabber, sir!
At the end, Captain America's shield interacts with the Star Quartz, causing Dr. Doom's armor and helicopter to melt and crash. Then this happens:
Captain America: Give it here or the world will know what kind of underpants a despot wears!
Dr. Doom: HA! I'm wearing... A METAL THONG!
Captain America: *gives Doom the exact same suspicious stare he gave Iron Man*
Dr. Doom: BLAST IT! No, no, don't look! Just kidding! JUST KIDDING!
Various heroes going out to use their vacation time. Captain America? He's talking to Ed Brubanker on the phone while dressed like a Confederate soldier.
Captain America: It's the Civil War, what could happen?