To amuse someone.
tickle someone's pickle
To amuse or astonish someone.
tickle the ear
To flatter someone.
chill to the bone
To make someone extremely cold, or to be extremely cold.
bundle of laughs
Something or someone very funny or fun.
barrel of monkeys
Someone or something very amusing or funny, fun, mischievous, etc.
breed in the bone
To establish or ingrain firmly within someone's nature.