Haha i have some hilarious ones of my own.
1) Put used underwear in the bass amp and let the fragrance waft around the room everytime u play
2)Get all the band members to fart excessively,then run out,not before locking the door.When the studio owner goes in he won't know what hit him.
3)Use the drumset as tables for eating halfway during jamming.
4)Everyone play their instruments completely naked then calling the studio owner in to "check the amplifiers".
5)Mdm Tan of Bukit Anak Kambing aka My Sassy Neighbour:EHHHH!!! YOU MUST BE POSITIVE!!!!
6)财神到eh,(music),财神到eh,(music),财神到你的家门口!(Slimfit,真的有效吗?)