This picture.
Motormouth kitty
The sound of a certain doggie barking at the mailman!
Wasps, baby walruses, cownose stingrays, beeflies, hummingbird moths, jumping spiders, tree shrews, mouse lemurs, harp seal pups, american curls, tiny octopi, dragonfly nymphs, angel orchids, bubble eye goldfish, lovebirds, tardigrades, slime molds, and every other known non-sapient organism
Any baby mammal or bird. Some baby reptiles or fish. No baby insects.
This little critter:
Future bacon.
Awwwww ! Put the flame out !!!
I go "awwwwww" every time someone puts Roosters flame out! No beans for him tonight! LOL!
Cats.
This baby.