Injustice 2 The Joker

as you will be able to put the game play on very easy to play i did it so i could thought it you all fast because i wanted you to see Joker's story at the end of it . it is so awesome. and yeah hey if you all could help me out what dose that HA HA thing The Joker have do as you will see i try to use it but i do not think it dose any thing after i use it. plzz let me if you know what dose thank you very much.