Kid: Mom! You lied to me!
Mom: When?
Kid: You told me that my little brother was an Angel!
Mom: Sooo?
Kid: Then why didn’t he fly when I threw him off the balcony?
Mom: WHAT!!!??!!
Kid: Mom! You lied to me!
Mom: When?
Kid: You told me that my little brother was an Angel!
Mom: Sooo?
Kid: Then why didn’t he fly when I threw him off the balcony?
Mom: WHAT!!!??!!
The humor comes from the kid taking the 'angel' metaphor literally and trying to see if his baby brother could fly. This misunderstanding of a common expression leads to a dark twist, as the kid reveals he threw the baby off the balcony.