I got an idea!
-So like Mario maybe smoke all of Luigi's weed.
- Mario forgot do to the laundry thus forcing Luigi to wear old clothes while he went on a date.
-Drank all his beer
-Tried to send him to Abudapie when they were younger.
-Exchanged Luigi as a sex slave for Bowser in exchange for a few Pogs
-Sended some embarrasing pictures of Luigi on the intrnet.
-Sold his house and told everybody that Luigi was dead and that the Luigi walking around was infact Bowser in disguise.
-He r0xx0rs in his b0xx0rs
-Started a boy band that would solve mysteries without inviting Luigi.
-Farted on his face
-Wrote a book "Luigi and why he can't keep a girlfriend"
-Mario defeated him infront of the princess in Super Smash brother melee
-Whoops Bowsers ass without inviting him
-Forgot to warn Luigi that poker night was canceled
And thats about it....